Detector and detection method for BNCT beam quality measurement

Abstract

The invention discloses a detector and a detection method for BNCT beam quality measurement, and the detector comprises a first IP board, a second IP board, a third IP board and a fourth IP board, the first IP board, the second IP board, the third IP board and the fourth IP board are sequentially stacked, each IP board sequentially comprises a protection layer, a sensitive layer, a backboard layer and a ferromagnetic layer, wherein the first IP plate adopts an optical excitation luminescent material as a sensitive layer material and is used for measuring gamma rays in a beam current; a sensitive layer material of the second IP plate is formed by doping a thermal neutron sensitive material and a photoexcitation luminescent material, and is used for measuring thermal neutrons in a beam current; a sensitive layer material of the third IP plate is formed by doping an epithermal neutron sensitive material and a light excitation luminescent material, and is used for measuring epithermal neutrons in the beam current; a sensitive layer material of the fourth IP plate is formed by doping a light-excited luminescent material and an H-containing fast neutron sensitive material and is used for measuring fast neutrons in a beam, and the third IP plate and the fourth IP plate are externally wrapped with a thermal neutron absorption layer.

Description

Technical Field

[0001] This invention relates to the field of beam quality measurement technology, and specifically to a detector and detection method for BNCT beam quality measurement. Background Technology

[0002] In the field of neutron beam quality measurement, existing technologies mainly rely on scintillator detectors, semiconductor detectors, and gas detectors. Scintillator detectors measure beam quality by the interaction between neutrons and the scintillating material, making them suitable for intensity monitoring; however, their functionality is limited, providing only beam intensity or energy distribution, and they cannot comprehensively assess beam quality. Semiconductor detectors rely on charge signals for measurement, offering good energy resolution, but their measurement efficiency is low, especially in low-energy neutron measurements, and they cannot simultaneously measure different energy components. Gas detectors possess good spatial resolution, but their sensitivity is low, typically providing only single-dimensional information, such as beam intensity or basic energy spectrum characteristics.

[0003] Current technologies cannot simultaneously and accurately separate and measure different types of radiation components, such as thermal neutrons, ultrathermal neutrons, fast neutrons, and gamma rays, in a BNCT irradiation environment. The spatial distribution of these radiation components is crucial to the therapeutic effect in BNCT treatment, but current technologies are insufficient in their sensitivity to measuring different radiation components and cannot precisely enhance and separate specific radiation components. Summary of the Invention

[0004] To achieve the above and other related objectives, this invention discloses a detector for BNCT beam quality measurement, comprising:

[0005] The first IP board, the second IP board, the third IP board, and the fourth IP board are stacked sequentially. Each IP board includes, in sequence, a protective layer, a sensitive layer, a backplane layer, and a ferromagnetic layer, wherein:

[0006] The first IP board uses a light-excited luminescent material as the sensitive layer material to measure gamma rays in the beam;

[0007] The sensitive layer material of the second IP plate is composed of thermal neutron sensitive material and photo-excited luminescent material doped together, and is used to measure thermal neutrons in the beam;

[0008] The sensitive layer material of the third IP plate is composed of doped ultrathermal neutron sensitive material and photo-excited luminescent material, and is used to measure ultrathermal neutrons in the beam.

[0009] The sensitive layer material of the fourth IP plate is composed of photo-excited luminescent material and H-containing fast neutron sensitive material, and is used to measure fast neutrons in the beam. The third IP plate and the fourth IP plate are wrapped with a thermal neutron absorbing layer.

[0010] Preferably, the first IP board, the second IP board, the third IP board and the fourth IP board are all wrapped with a light-shielding layer.

[0011] Preferably, in the sensitive layer material of the second IP plate, the thermal neutron sensitive material accounts for 5% to 10% of the mass of the sensitive layer material of the second IP plate.

[0012] Preferably, in the sensitive layer material of the third IP plate, the mass of the superthermal neutron sensitive material accounts for 5% to 10% of the sensitive layer material of the third IP plate.

[0013] Preferably, in the sensitive layer material of the fourth IP plate, the mass of the fast neutron sensitive material containing H accounts for 5% to 10% of the sensitive layer material of the fourth IP plate.

[0014] Preferably, the thermal neutron absorbing layer completely covers the outer surface of the third IP plate and the fourth IP plate.

[0015] Preferably, the thickness of the sensitive layer of the first IP board, the second IP board, the third IP board and the fourth IP board is 0.1mm to 0.3mm.

[0016] Secondly, the present invention provides a method for measuring BNCT beam quality using a detector, characterized in that the detector is the detector used for BNCT beam quality measurement, comprising the following steps:

[0017] Signal cancellation preprocessing is performed sequentially on the first IP board, the second IP board, the third IP board, and the fourth IP board to eliminate residual signals;

[0018] The third IP plate and the fourth IP plate are assembled and wrapped with a thermal neutron absorbing layer on the outside;

[0019] The first IP plate, the second IP plate, the third IP plate and the fourth IP plate after being wrapped with a thermal neutron absorption layer are assembled, and a light-shielding layer is wrapped on the outside to obtain the assembled detector.

[0020] The detector is irradiated with an ultrathermal neutron beam, and then cooled after the irradiation is completed.

[0021] Read the signals from the first IP board, the second IP board, the third IP board, and the fourth IP board respectively;

[0022] The signal is analyzed and processed to complete the beam quality measurement.

[0023] By adopting the above technical solution, the sensitive layer material of commercial IP plates is improved by doping it with materials that have high sensitivity to different radiation components, thereby optimizing the sensitivity response to each radiation component and solving the technical bottleneck of radiation component separation. This method significantly improves the measurement accuracy and sensitivity of radiation components, providing higher precision for BNCT beam quality measurement. Through innovative multi-IP plate system design and optimized combination of various sensitive materials, it overcomes the shortcomings of existing technologies in multi-radiation component measurement, accuracy control, and system flexibility. Compared with traditional single radiation detection methods, this invention not only provides high-precision separation and simultaneous measurement of different radiation types, but also significantly improves the stability of measurement results and the adaptability of the system. Especially in BNCT treatment, it provides strong technical support for quality control of treatment, and has great application potential and market value. Attached Figure Description

[0024] The above and other features, advantages, and aspects of the embodiments of this disclosure will become more apparent from the accompanying drawings and the following detailed description. The drawings are provided for a better understanding of the invention and are not intended to limit the scope of this disclosure. In the drawings, the same or similar reference numerals denote the same or similar elements, wherein:

[0025] Figure 1 This is a cross-sectional structural diagram of an embodiment of the present invention.

[0026] Reference numerals in the attached figures: 1. First IP plate; 2. Second IP plate; 3. Third IP plate; 4. Fourth IP plate; 5. Light-shielding layer; 6. Thermal neutron absorption layer; 71. Protective layer; 72. Sensitive layer; 73. Backing plate layer; 74. Ferromagnetic layer. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Reference Figure 1 This invention provides a detector for BNCT beam quality measurement, comprising: a first IP plate 1, a second IP plate 2, a third IP plate 3, and a fourth IP plate 4, wherein the first IP plate 1, the second IP plate 2, the third IP plate 3, and the fourth IP plate 4 are stacked sequentially, and each IP plate comprises a protective layer 71, a sensitive layer 72, a backplate layer 73, and a ferromagnetic layer 74 in sequence.

[0029] The protective layer 71, sensitive layer 72, backing layer 73, and ferromagnetic layer 74 are stacked sequentially and fixedly connected to each other. The connection method and positional relationship of the protective layer 71, sensitive layer 72, backing layer 73, and ferromagnetic layer 74 are well known to those skilled in the art and will not be described in detail here. The thickness of the protective layer 71 ranges from 0.01 mm to 0.05 mm, the thickness of the sensitive layer 72 ranges from 0.1 mm to 0.3 mm, the thickness of the backing layer 73 ranges from 0.1 mm to 0.2 mm, and the thickness of the ferromagnetic layer 74 ranges from 0.05 mm to 0.1 mm. The specific thickness can be set by those skilled in the art according to actual needs. Among them, the sensitive layer 72 is the core functional layer of the IP board, and its thickness directly affects the radiation detection efficiency. When it is necessary to detect medical BNCT beams, the thickness of the sensitive layer 72 is set to the upper limit of 0.3 mm to improve the signal-to-noise ratio. When detecting low-flux beams in the laboratory, the thickness of the sensitive layer 72 is set to the lower limit of 0.1 mm to shorten the signal reading time.

[0030] The difference between the first IP board 1, the second IP board 2, the third IP board 3 and the fourth IP board 4 is that the materials used for the sensitive layer 72 are different. The materials of the sensitive layer 72 of each IP board are described below.

[0031] The first IP plate 1 uses a photo-excited luminescent material as the sensitive layer 72 material for measuring gamma rays in the beam; preferably, the photo-excited luminescent material is BaFBr:Eu. 2+ .

[0032] The sensitive layer 72 of the second IP plate 2 is composed of a thermal neutron-sensitive material and a photo-excited luminescent material, and is used to measure thermal neutrons in the beam. In the sensitive layer 72 of the second IP plate 2, the mass of the thermal neutron-sensitive material accounts for 5% to 10% of the total mass of the sensitive layer 72 material; in this embodiment, 10% is preferred. Preferably, the thermal neutron-sensitive material in this embodiment of the invention uses… 6 LiF or B2O3.

[0033] The sensitive layer 72 of the third IP plate 3 is composed of a superthermal neutron-sensitive material and a photo-excited luminescent material, and is used to measure superthermal neutrons in the beam. In the material of the sensitive layer 72 of the third IP plate 3, the mass of the superthermal neutron-sensitive material accounts for 5% to 10% of the total mass of the sensitive layer 72 material of the third IP plate 3. In this embodiment, it is preferably 10%. Preferably, the superthermal neutron-sensitive material in this embodiment of the invention uses... 6 LiF or B2O3

[0034] The sensitive layer 72 of the fourth IP plate 4 is composed of a photo-excited luminescent material and an H-containing fast neutron sensitive material. The H-containing fast neutron sensitive material increases the IP plate's detection sensitivity to fast neutrons through the reaction of fast neutrons with hydrogen, and is used to measure fast neutrons in the beam. In the sensitive layer 72 of the fourth IP plate 4, the mass of the H-containing fast neutron sensitive material accounts for 5% to 10% of the total mass of the sensitive layer 72 material of the fourth IP plate 4; in this embodiment, it is preferably 10%. Preferably, the H-containing fast neutron sensitive material used in this embodiment is polyethylene or epoxy resin.

[0035] In this embodiment, the third IP plate 3 and the fourth IP plate 4 are externally wrapped with a thermal neutron absorbing layer 6. The thermal neutron absorbing layer 6 completely covers the outer surface of the third IP plate 3 and the fourth IP plate 4. A thermal neutron absorbing layer 6 is also disposed between the second IP plate 2 and the third IP plate 3. The thermal neutron absorbing layer 6 can effectively improve the detector's ability to separate ultrathermal neutrons and fast neutrons in the beam, filtering out thermal neutrons in the beam, thereby reducing interference from thermal neutrons during the detection process of the third IP plate 3 and the fourth IP plate 4, and improving the detection accuracy of the third IP plate 3 and the fourth IP plate 4. In this embodiment, the thickness of the thermal neutron absorbing layer 6 ranges from 0.2 mm to 0.5 mm, and can be determined by those skilled in the art according to actual usage needs. Preferably, in this embodiment, a Cd film is used as the thermal neutron absorbing layer 6.

[0036] The first IP board 1, the second IP board 2, the third IP board 3, and the fourth IP board 4 are all wrapped with a light-shielding layer 5. The light-shielding layer 5 can reduce the signal loss of the IP board after being irradiated by the beam, so that the IP board maintains a good signal strength during reading after irradiation, reduces signal loss, and improves detection accuracy. Moreover, the light-shielding layer 5, through its integrated wrapping design, can ensure that the physical position of the first IP board 1, the second IP board 2, the third IP board 3, and the fourth IP board 4 is fixed during the irradiation process, reducing errors caused by relative displacement, and enabling the four IP boards to be measured in the same beam irradiation process, eliminating the fluctuation error of separate measurements.

[0037] This invention also provides a detection method for BNCT beam quality measurement, which uses the above-mentioned detector for beam detection and includes the following steps:

[0038] The first IP board 1, the second IP board 2, the third IP board 3 and the fourth IP board 4 are sequentially placed into the reader for signal cancellation preprocessing to eliminate any possible residual signals.

[0039] The third IP plate 3 and the fourth IP plate 4 are assembled and wrapped with a thermal neutron absorbing layer 6 on the outside;

[0040] The first IP plate 1, the second IP plate 2, the third IP plate 3 and the fourth IP plate 4 after being wrapped with the thermal neutron absorption layer 6 are assembled, and a light-shielding layer 5 is wrapped on the outside.

[0041] The assembled detector is placed at the outlet of the superheated neutron beam for irradiation, and then cooled for a first preset time period after irradiation.

[0042] The signals of the first IP board 1, the second IP board 2, the third IP board 3 and the fourth IP board 4 are read using a reader respectively;

[0043] The read signals are analyzed and processed to evaluate the beam quality.

[0044] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the meaning consistent with their meaning in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined.

[0045] For the sake of simplicity, the method embodiments are described as a series of actions. However, those skilled in the art should understand that the embodiments of the present invention are not limited to the described order of actions, because according to the embodiments of the present invention, some steps can be performed in other orders or simultaneously. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions involved are not necessarily essential to the embodiments of the present invention.

[0046] As can be seen from the above description of the embodiments, those skilled in the art can clearly understand that this application can be implemented by means of software plus necessary general-purpose hardware platforms. Based on this understanding, the technical solution of this application, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in various embodiments or some parts of the embodiments of this application. Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A detector for BNCT beam quality measurement, characterized in that, include: The first IP board, the second IP board, the third IP board, and the fourth IP board are stacked sequentially. Each IP board includes, in sequence, a protective layer, a sensitive layer, a backplane layer, and a ferromagnetic layer, wherein: The first IP board uses a light-excited luminescent material as the sensitive layer material to measure gamma rays in the beam; The sensitive layer material of the second IP plate is composed of thermal neutron sensitive material and photo-excited luminescent material doped together, and is used to measure thermal neutrons in the beam; The sensitive layer material of the third IP plate is composed of doped ultrathermal neutron sensitive material and photo-excited luminescent material, and is used to measure ultrathermal neutrons in the beam. The sensitive layer material of the fourth IP plate is composed of photo-excited luminescent material and H-containing fast neutron sensitive material, and is used to measure fast neutrons in the beam. The third IP plate and the fourth IP plate are wrapped with a thermal neutron absorbing layer.

2. The detector for BNCT beam quality measurement according to claim 1, characterized in that, The first IP board, the second IP board, the third IP board, and the fourth IP board are all wrapped with a light-shielding layer.

3. The detector for BNCT beam quality measurement according to claim 1, characterized in that, In the sensitive layer material of the second IP plate, the thermal neutron sensitive material accounts for 5% to 10% of the mass of the sensitive layer material of the second IP plate.

4. The detector for BNCT beam quality measurement according to claim 1, characterized in that, In the sensitive layer material of the third IP plate, the mass of the superthermal neutron sensitive material accounts for 5% to 10% of the sensitive layer material of the third IP plate.

5. A detector for BNCT beam quality measurement according to claim 1, characterized in that, In the sensitive layer material of the fourth IP plate, the mass of the fast neutron sensitive material containing H accounts for 5% to 10% of the sensitive layer material of the fourth IP plate.

6. A detector for BNCT beam quality measurement according to claim 1, characterized in that, The thermal neutron absorption layer completely covers the outer surface of the third IP plate and the fourth IP plate.

7. A detector for BNCT beam quality measurement according to claim 1, characterized in that, The thickness of the sensitive layer of the first IP board, the second IP board, the third IP board and the fourth IP board is 0.1mm to 0.3mm.

8. A method for measuring BNCT beam quality using a detector, characterized in that, The detector is the detector for BNCT beam quality measurement as described in any one of claims 1 to 7, and includes the following steps: Signal cancellation preprocessing is performed sequentially on the first IP board, the second IP board, the third IP board, and the fourth IP board to eliminate residual signals; The third IP plate and the fourth IP plate are assembled and wrapped with a thermal neutron absorbing layer on the outside; The first IP plate, the second IP plate, the third IP plate and the fourth IP plate after being wrapped with a thermal neutron absorption layer are assembled, and a light-shielding layer is wrapped on the outside to obtain the assembled detector. The detector is irradiated with an ultrathermal neutron beam, and then cooled after the irradiation is completed. Read the signals from the first IP board, the second IP board, the third IP board, and the fourth IP board respectively; The signal is analyzed and processed to complete the beam quality measurement.

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