Composite boron neutron capture therapy neck directional radiation protection scarf

Abstract

The utility model discloses a composite boron neutron capture therapy neck directional radiation protection neck warmer, including the rear neck protection cover of the open rear end along the axial arrangement, the lower extreme of rear neck protection cover is provided with the extension, and the bottom of rear neck protection cover is connected with the shoulder of the extension through the extension, the opposite opening both sides of rear neck protection cover are provided with medical grade magic tape respectively, and the other end of medical grade magic tape is connected with neck warmer protection block, and the inside of neck warmer protection block is provided with the neutron absorption layer for reducing the radiation damage of thyroid part to neutron and the secondary ray shield layer for shielding the secondary photon of neutron protection process. The utility model solves the problem that the weight of protection instrument is big, and the problem that wearing does not fit the neck of patient in the prior art.

Description

Technical Field

[0001] This utility model belongs to the field of medical radiation protection device technology, specifically relating to a composite boron neutron capture therapy neck directional radiation protection scarf. Background Technology

[0002] ‌ Boron neutron capture therapy (BNCT) is a novel and precise radiotherapy technique that combines targeted drugs with neutron irradiation. It has made significant progress in its widespread adoption in recent years, bringing new hope to many cancer patients. Currently, there are over 2,000 clinical applications of BNCT worldwide, and its efficacy in treating head and neck tumors, malignant meningiomas, melanoma, and hepatocellular carcinoma has been confirmed. Its potential application in other disease sites such as breast cancer and prostate cancer is also under investigation.

[0003] However, during BNCT treatment, a combined neutron and secondary photon radiation field is generated, posing a risk of radiation damage to the patient's thyroid region. Specifically, neutrons are produced by boron-10 capturing thermal neutrons. The resulting alpha particles and lithium ions have extremely short ranges in biological tissues, primarily depositing energy within cancer cells to selectively kill them. However, neutron rays also cause some radiation damage to surrounding healthy tissues. Simultaneously, secondary rays are secondary radiation generated by the interaction of neutrons with matter. Especially when irradiating deep tumors during treatment, the generation of secondary photons is unavoidable, also posing a radiation risk to surrounding healthy tissues. Therefore, during BNCT treatment, synergistic protection against neutrons and secondary photons is necessary to protect the patient's sensitive organs, reduce the risk of radiation damage, and improve the safety and efficacy of the treatment.

[0004] Existing thyroid protection devices, such as lead-rubber neck braces, suffer from drawbacks including heavy weight and the risk of lead powder leakage due to wear and tear. Lead, on the other hand, is ineffective in addressing the need for synergistic protection against multiple types of radiation, and as a heavy metal, it is toxic, posing a significant risk of secondary pollution should a leak occur. Furthermore, traditional devices often employ fixed shapes, such as the neck braces mentioned in applications CN202420209803.7 and CN201922204826.0, which use standardized geometric shapes. Since neck shapes vary considerably among patients, standardized geometric designs cannot perfectly fit all patients' necks. Alternatively, traditional protective materials like lead-rubber, as described in application CN202223458295.6, are too rigid, lacking sufficient flexibility and malleability to be effectively adjusted to the neck's contours. During wear, gaps can easily appear between the device and the neck, failing to create a proper seal and thus affecting protective performance. Utility Model Content

[0005] The purpose of this invention is to provide a composite boron neutron capture therapy neck shield for directional radiation protection, which solves the problems of existing protective devices being heavy and not fitting the patient's neck properly.

[0006] The technical solution adopted in this utility model is a composite boron neutron capture therapy neck directional radiation protection neck brace, including a rear neck protection sleeve with an opening along the axial direction at the front end, an extension at the lower end of the rear neck protection sleeve, and a shoulder strap connected to the bottom of the rear neck protection sleeve through the extension.

[0007] The back neck protector is provided with medical-grade Velcro on both sides of the opening. The other end of the medical-grade Velcro is connected to a neck protection block. The neck protection block is provided with a neutron absorption layer to reduce neutron radiation damage to the thyroid area and a secondary radiation shielding layer to shield secondary photons generated during neutron protection.

[0008] The present invention is further characterized in that,

[0009] The rear neck protector is made of thermoplastic polyurethane elastomer or thermoplastic elastomer, and the maximum opening spacing of the rear neck protector is sufficient for the neck to pass through.

[0010] The shoulder strap is an open loop located at the bottom of the back neck protector. The shoulder strap is equipped with an elastic adjustment strap, which can be adjusted to change the opening spacing.

[0011] The neck protector is shaped like a butterfly to match the shape of a thyroid gland. The outer shell of the neck protector is made of thermoplastic polyurethane elastomer or thermoplastic elastomer. The neutron absorption layer and the secondary radiation shielding layer are disposed inside the outer shell, with the neutron absorption layer located outside the secondary radiation shielding layer. An isolation layer is disposed between the neutron absorption layer and the secondary radiation shielding layer, which is also made of thermoplastic polyurethane elastomer or thermoplastic elastomer.

[0012] The neutron absorption layer is made of gadolinium oxide or boron carbide.

[0013] The thickness of the neutron absorption layer is 2mm~3mm.

[0014] The secondary radiation shielding layer is any one or a combination of gadolinium oxide, bismuth trioxide, samarium trioxide, or tungsten trioxide.

[0015] The thickness of the secondary radiation shielding layer is 3mm to 5mm.

[0016] The beneficial effects of this utility model are:

[0017] (1) The composite boron neutron capture therapy neck directional radiation protection neck shawl of this utility model uses B4C / Gd2O3 as the neutron absorption layer, Bi2O3 / WO3 / Gd2O3 / Sm2O3 as the secondary radiation shielding layer, and uses thermoplastic elastomer as the matrix to separate the neutron absorption layer and the rare earth secondary photon shielding layer to form a three-layer flexible composite material structure, thereby achieving synergistic shielding against neutrons and secondary photons generated by neutron radiation.

[0018] Meanwhile, the use of thermoplastic elastomer as the matrix gives the overall protective neck warmer a lightweight design, reducing weight by more than 40% compared to traditional lead-based materials. It also has good biocompatibility and high-temperature sterilization resistance, and can be washed and reused, reducing medical costs and waste generation.

[0019] (2) The neck protection block of the composite boron neutron capture therapy neck directional radiation protection neck band is a butterfly-shaped structure that matches the shape of the thyroid gland. With medical-grade Velcro and elastic adjustment band, it can achieve three-dimensional adaptation of the neck, closely fit different neck shapes, ensure that it does not shift during treatment, and accurately protect the thyroid area. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the composite boron neutron capture therapy neck shield for directional radiation protection.

[0021] Figure 2 This is a cross-sectional view of the neck protection area in this utility model.

[0022] In the diagram, 1. Back neck protector, 2. Outer shell, 3. Neck protector block, 4. Neutron absorption layer, 5. Secondary radiation shielding layer, 6. Medical-grade Velcro, 7. Elastic adjustment strap, 8. Isolation layer, 9. Shoulder drape, 10. Extension. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Example 1

[0025] This utility model relates to a composite boron neutron capture therapy neck shield for directional radiation protection, such as... Figure 1As shown, the neck protector 1 includes an axially oriented opening at the front end. The neck protector 1 serves as the bottom layer of the neck brace and is made of skin-friendly thermoplastic elastomer materials such as TPU and TPE. It possesses good flexibility, abrasion resistance, and biocompatibility, allowing it to closely conform to the neck skin and provide a support platform for other components. Furthermore, to ensure the patient can wear the neck brace smoothly, the maximum opening spacing of the neck protector 1 is sufficient for neck passage.

[0026] Furthermore, the lower end of the rear neck protector 1 is provided with an extension 10, and the bottom of the rear neck protector 1 is connected to a shoulder strap 9 through the extension 10.

[0027] The back neck protector 1 has medical-grade Velcro 6 on each side of the opening. The other end of the medical-grade Velcro 6 is connected to a neck protection block 3. The neck protection block 3 has a neutron absorption layer 4 for reducing neutron radiation damage to the thyroid area and a secondary radiation shielding layer 5 for shielding secondary photons generated during neutron protection.

[0028] Example 2

[0029] This utility model relates to a composite boron neutron capture therapy neck shield for directional radiation protection, such as... Figure 1 As shown, it includes a neck protector 1 with an opening along the axial direction at the front end. The neck protector 1 serves as the bottom substrate of the neck warmer and is made of skin-friendly thermoplastic elastomer materials such as TPU and TPE. The maximum opening spacing of the neck protector 1 is sufficient for the neck to pass through.

[0030] Furthermore, the lower end of the rear neck protector 1 is provided with an extension 10, and the bottom of the rear neck protector 1 is connected to a shoulder strap 9 through the extension 10.

[0031] The back neck protector 1 has medical-grade Velcro 6 on both sides of its opening. The Velcro 6 consists of hook and loop sides and features a specially encrypted design. Installed at both ends of the back neck protector 1, it achieves a three-dimensional fit to the neck through adhesive, ensuring a tight fit to different neck shapes and maintaining good adhesion even after repeated use. The other end of the Velcro 6 is connected to a neck protector block 3. The hook side of the Velcro 6 is located on the surface of the neck protector block 3. The neck protector block 3 contains a neutron absorption layer 4 to reduce neutron radiation damage to the thyroid gland and a secondary radiation shielding layer 5 to shield against secondary photons generated during neutron protection.

[0032] Furthermore, the shoulder strap 9 is set in an open loop at the bottom of the back neck protector 1, and an elastic adjustment strap 7 is provided on the shoulder strap 9. The opening spacing of the shoulder strap 9 can be adjusted by stretching and adjusting the elastic adjustment strap 7 according to the thickness of the patient's neck, further improving the fit and comfort, and ensuring that the neck protector does not shift during treatment.

[0033] Example 3

[0034] This utility model relates to a composite boron neutron capture therapy neck shield for directional radiation protection, such as... Figure 1 As shown, it includes a neck protector 1 with an opening along the axial direction at the front end. The neck protector 1 serves as the bottom substrate of the neck warmer and is made of skin-friendly thermoplastic elastomer materials such as TPU and TPE. The maximum opening spacing of the neck protector 1 is sufficient for the neck to pass through.

[0035] Furthermore, the lower end of the rear neck protector 1 is provided with an extension 10, and the bottom of the rear neck protector 1 is connected to a shoulder strap 9 through the extension 10.

[0036] The back neck protector 1 has medical-grade Velcro 6 on both sides of the opening. The medical-grade Velcro 6 includes a hook side and a loop side. The other end of the medical-grade Velcro 6 is connected to a neck protection block 3. The neck protection block 3 has a neutron absorption layer 4 for reducing neutron radiation damage to the thyroid area and a secondary radiation shielding layer 5 for shielding secondary photons generated during neutron protection.

[0037] Furthermore, the shoulder strap 9 is set in an open loop at the bottom of the back neck protection sleeve 1. The shoulder strap 9 is equipped with an elastic adjustment strap 7, which can be stretched and adjusted according to the thickness of the patient's neck to further improve the fit and comfort, and ensure that the neck protection does not shift during treatment.

[0038] Furthermore, the neck protection block 3 is shaped like a butterfly to match the shape of the thyroid gland, and has a high-contrast, wear-resistant thyroid anatomical positioning mark on the outside, printed with medical ink, which makes it easy for medical staff to accurately identify and protect the thyroid area.

[0039] like Figure 2 As shown, the outer shell 2 of the neck protector block 3 is made of thermoplastic polyurethane elastomer or thermoplastic elastomer. The neutron absorption layer 4 and the secondary radiation shielding layer 5 are disposed inside the outer shell 2, with the neutron absorption layer 4 located outside the secondary radiation shielding layer 5. An isolation layer 8, also made of thermoplastic polyurethane elastomer or thermoplastic elastomer, is disposed between the neutron absorption layer 4 and the secondary radiation shielding layer 5. The isolation layer 8 is tightly fitted to the neutron absorption layer 4 to achieve a synergistic protective effect.

[0040] When in use, this utility model consists of three parts: the wearing process, the treatment process, and the cleaning process.

[0041] Wearing process: Before BNCT treatment, medical staff adjust the length of the fixed elastic adjustment strap 7 according to the patient's neck size, and attach the neck warmer to the patient's neck using medical-grade Velcro 6. Ensure that the thyroid anatomical positioning mark of the neck warmer protective block 3 is accurately aligned with the thyroid area, and that the non-protected back neck protective sleeve 1 naturally covers the other areas around the neck, so that the neck warmer fits tightly against the neck skin without wrinkles or gaps.

[0042] Treatment process: During treatment, the neutron absorption layer 4 effectively absorbs thermal neutrons, and the secondary radiation shielding layer 5 blocks secondary photons generated during neutron protection. Together, they achieve comprehensive and precise protection of the thyroid gland, reduce the radiation dose to the thyroid gland, and improve the safety of treatment.

[0043] Cleaning process: After treatment, remove the neck warmer and clean it with medical cleaner to remove surface stains and sweat. After high-temperature sterilization, it can be reused. If it is used too many times, the neck warmer protective block 3 can be removed and the main support part can be cleaned to reduce medical costs and avoid cross-infection.

[0044] Example 4

[0045] This utility model relates to a composite boron neutron capture therapy neck shield for directional radiation protection, such as... Figure 1 As shown, it includes a neck protector 1 with an opening along the axial direction at the front end. The neck protector 1 serves as the bottom substrate of the neck warmer and is made of skin-friendly thermoplastic elastomer materials such as TPU and TPE. The maximum opening spacing of the neck protector 1 is sufficient for the neck to pass through.

[0046] The lower end of the rear neck protector 1 is provided with an extension 10, and the bottom of the rear neck protector 1 is connected to a shoulder strap 9 through the extension 10.

[0047] The back neck protector 1 has medical-grade Velcro 6 on both sides of the opening. The medical-grade Velcro 6 includes a hook side and a loop side. The other end of the medical-grade Velcro 6 is connected to a neck protection block 3. The neck protection block 3 has a neutron absorption layer 4 for reducing neutron radiation damage to the thyroid area and a secondary radiation shielding layer 5 for shielding secondary photons generated during neutron protection.

[0048] The shoulder strap 9 is set in an open loop at the bottom of the back neck protection sleeve 1. The shoulder strap 9 is equipped with an elastic adjustment strap 7, which can be stretched and adjusted according to the thickness of the patient's neck to further improve the fit and comfort, and ensure that the neck protection does not shift during treatment.

[0049] The outer shell 2 of the neck protection block 3 is made of thermoplastic polyurethane elastomer or thermoplastic elastomer. The neutron absorption layer 4 and the secondary radiation shielding layer 5 are disposed inside the outer shell 2, with the neutron absorption layer 4 located outside the secondary radiation shielding layer 5. An isolation layer 8, also made of thermoplastic polyurethane elastomer or thermoplastic elastomer, is disposed between the neutron absorption layer 4 and the secondary radiation shielding layer 5. The isolation layer 8 is tightly fitted to the neutron absorption layer 4 to achieve a synergistic protective effect.

[0050] Furthermore, the neutron absorption layer 4 is composed of gadolinium oxide or boron carbide. Both gadolinium (Gd) in gadolinium oxide and boron (B) in boron carbide possess extremely high thermal neutron absorption cross-sections (i.e., a very strong ability to capture neutrons). Thermal neutrons are the type of neutron radiation that causes significant damage to human tissues. When neutron radiation passes through the neutron absorption layer, gadolinium and boron efficiently capture thermal neutrons, absorbing their energy through nuclear reactions and converting it into other forms of energy (such as low-energy gamma rays or thermal energy). This significantly reduces the number of neutrons penetrating the absorption layer, effectively reducing neutron radiation damage to the thyroid gland.

[0051] Example 5

[0052] This utility model relates to a composite boron neutron capture therapy neck shield for directional radiation protection, such as... Figure 1 As shown, it includes a neck protector 1 with an opening along the axial direction at the front end. The neck protector 1 serves as the bottom substrate of the neck warmer and is made of skin-friendly thermoplastic elastomer materials such as TPU and TPE. The maximum opening spacing of the neck protector 1 is sufficient for the neck to pass through.

[0053] The lower end of the rear neck protector 1 is provided with an extension 10, and the bottom of the rear neck protector 1 is connected to a shoulder strap 9 through the extension 10.

[0054] The back neck protector 1 has medical-grade Velcro 6 on both sides of the opening. The medical-grade Velcro 6 includes a hook side and a loop side. The other end of the medical-grade Velcro 6 is connected to a neck protection block 3. The neck protection block 3 has a neutron absorption layer 4 for reducing neutron radiation damage to the thyroid area and a secondary radiation shielding layer 5 for shielding secondary photons generated during neutron protection.

[0055] The shoulder strap 9 is set in an open loop at the bottom of the back neck protection sleeve 1. The shoulder strap 9 is equipped with an elastic adjustment strap 7, which can be stretched and adjusted according to the thickness of the patient's neck to further improve the fit and comfort, and ensure that the neck protection does not shift during treatment.

[0056] The outer shell 2 of the neck protection block 3 is made of thermoplastic polyurethane elastomer or thermoplastic elastomer. The neutron absorption layer 4 and the secondary radiation shielding layer 5 are disposed inside the outer shell 2, with the neutron absorption layer 4 located outside the secondary radiation shielding layer 5. An isolation layer 8, also made of thermoplastic polyurethane elastomer or thermoplastic elastomer, is disposed between the neutron absorption layer 4 and the secondary radiation shielding layer 5. The isolation layer 8 is tightly fitted to the neutron absorption layer 4 to achieve a synergistic protective effect.

[0057] Neutron absorption layer 4 is made of gadolinium oxide or boron carbide. Utilizing the high absorption cross-section of gadolinium and boron for neutrons, thermal neutrons are absorbed efficiently, effectively reducing radiation damage to the thyroid gland.

[0058] Furthermore, the secondary radiation shielding layer 5 is composed of any one or more rare earth elements selected from gadolinium oxide, bismuth trioxide, samarium trioxide, or tungsten trioxide. When neutrons are absorbed by the neutron absorption layer (such as gadolinium oxide or boron carbide), the nuclear reaction process is accompanied by the generation of secondary photons (mainly low-energy gamma rays). If these secondary photons penetrate into the thyroid gland, they will interact with atoms in the thyroid tissue through photoelectric effects, Compton scattering, and other processes, leading to cell damage.

[0059] The secondary radiation shielding layer 5 uses materials such as gadolinium oxide, bismuth trioxide, samarium trioxide, and tungsten trioxide, all of which contain elements with high atomic numbers (gadolinium, bismuth, samarium, and tungsten). These elements have a strong attenuation ability for photons (especially low-energy secondary photons)—significantly reducing their penetration intensity by absorbing or scattering secondary photons. Simultaneously, the shielding equivalent of this layer reaches 0.66 mmPb (i.e., the shielding effect is equivalent to 0.66 mm thick lead), effectively intercepting secondary photons and reducing the dose of secondary photons reaching the thyroid gland, thereby preventing radiation damage to the thyroid.

[0060] Example 6

[0061] Based on Embodiment 5 above, the thickness of the neutron absorbing layer 4 in this embodiment is 2mm to 3mm. Setting the thickness of the neutron absorbing layer 4 within the range of 2mm to 3mm is the optimal choice considering both neutron absorption efficiency and the requirements of practical application scenarios. While its core materials, gadolinium oxide (containing gadolinium) or boron carbide (containing boron), possess extremely high thermal neutron absorption cross-sections, the absorption effect is directly related to the material thickness: a basic thickness of 2mm can meet the requirements for efficient thermal neutron capture under conventional radiation environments, intercepting most incident thermal neutrons through the strong interaction between gadolinium and boron elements and thermal neutrons; while the upper limit thickness of 3mm is designed for scenarios with high neutron flux, further improving absorption redundancy and ensuring that even in complex radiation fields, the number of neutrons penetrating the absorbing layer can be minimized, reducing the radiation dose reaching the thyroid gland from the source. Simultaneously, the 2mm to 3mm thickness also takes into account the need for lightweight structure, avoiding inconvenience in wearing or installation due to excessive thickness, thus balancing protective performance and practicality.

[0062] The thickness of the secondary radiation shielding layer 5 is 3mm to 5mm. This 3mm to 5mm thickness is designed to meet its core function of shielding secondary photons. When neutrons are intercepted by the absorption layer, nuclear reactions produce secondary photons (such as low-energy gamma rays). The material of this shielding layer (gadolinium oxide, bismuth trioxide, etc.) contains elements with high atomic numbers, and its photon attenuation capability increases with thickness: a thickness of 3mm meets the shielding requirements for conventional secondary photons. Utilizing the photoelectric effect and Compton scattering of high atomic number elements, the energy of secondary photons rapidly attenuates during penetration, achieving a shielding equivalent of 0.66mmPb. The upper limit thickness of 5mm is designed for extreme scenarios with high secondary photon flux. By increasing the material thickness, the attenuation efficiency is further improved, ensuring that even in strong secondary radiation environments, photon penetration is effectively blocked, preventing damage to sensitive thyroid tissue. In addition, the thickness range of 3mm to 5mm can be flexibly adapted to different radiation intensity scenarios, ensuring the protective effect while avoiding the structural bulkiness caused by excessive thickness, thus balancing the reliability of protection and the ease of use.

[0063] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0064] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0065] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A composite boron neutron capture therapy neck shield for directional radiation protection, characterized in that, Includes a neck protector (1) with an opening along the axial direction at the front end, and an extension (10) at the lower end of the neck protector (1). The bottom of the neck protector (1) is connected to a shoulder strap (9) through the extension (10). The back neck protector (1) is provided with medical-grade Velcro (6) on both sides of the opening. The other end of the medical-grade Velcro (6) is connected to a neck protection block (3). The neck protection block (3) is provided with a neutron absorption layer (4) for reducing neutron radiation damage to the thyroid gland and a secondary radiation shielding layer (5) for shielding secondary photons generated during neutron protection.

2. The composite boron neutron capture therapy neck shielding for directional radiation therapy according to claim 1, characterized in that, The rear neck protection sleeve (1) is made of thermoplastic polyurethane elastomer or thermoplastic elastomer, and the maximum opening spacing of the rear neck protection sleeve (1) is sufficient for the neck to pass through.

3. The composite boron neutron capture therapy neck shielding according to claim 1, characterized in that, The shoulder strap (9) is set in an open ring shape at the bottom of the back neck protection sleeve (1). An elastic adjustment strap (7) is provided on the shoulder strap (9). The opening spacing of the shoulder strap (9) is adjusted by scaling the elastic adjustment strap (7).

4. The composite boron neutron capture therapy neck shielding for directional radiation therapy according to claim 1, characterized in that, The neck protection block (3) is butterfly-shaped to match the shape of the thyroid gland. The outer shell (2) of the neck protection block (3) is thermoplastic polyurethane elastomer or thermoplastic elastomer. The neutron absorption layer (4) and the secondary radiation shielding layer (5) are disposed inside the outer shell (2), and the neutron absorption layer (4) is located outside the secondary radiation shielding layer (5). An isolation layer (8) is disposed between the neutron absorption layer (4) and the secondary radiation shielding layer (5). The isolation layer (8) is also thermoplastic polyurethane elastomer or thermoplastic elastomer.

5. The composite boron neutron capture therapy neck shielding for directional radiation protection according to claim 1, characterized in that, The neutron absorption layer (4) is gadolinium oxide or boron carbide.

6. The composite boron neutron capture therapy neck shielding for directional radiation therapy according to claim 5, characterized in that, The thickness of the neutron absorption layer (4) is 2mm~3mm.

7. The composite boron neutron capture therapy neck shielding for directional radiation protection according to claim 1, characterized in that, The secondary radiation shielding layer (5) is any one or a combination of gadolinium oxide, bismuth trioxide, samarium trioxide or tungsten trioxide.

8. The composite boron neutron capture therapy neck shielding for directional radiation therapy according to claim 1, characterized in that, The thickness of the secondary radiation shielding layer (5) is 3mm to 5mm.

Images