A heavy water reactor production 99 Target nuclei of Mo, production elements, and production assemblies

Abstract

The application discloses a kind of heavy water reactor production 99 The target nucleus of Mo includes target tube, target material layer and neutron absorber material, the target material layer is sleeved on the target tube, and the both ends of the target tube are respectively connected with inner end plug, and the neutron absorber material is arranged in the target tube. 99 The target nucleus production element of Mo includes target nucleus, cladding tube, isolation block, support block and outer end plug, the target nucleus is arranged in the circular tube-shaped cladding tube, the both ends of the cladding tube are welded with outer end plug to seal it, and the outer part of the cladding tube is respectively welded with isolation block and / or support block. The production assembly includes production element and end plate, and the end plate is welded and connected with the both ends of the production element. The beneficial effects of the application are that the effect of the application is to produce carrier-free 99 Mo while producing electricity by heavy water reactor, which meets the demand of nuclear medicine field for 99 Mo.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of nuclear technology, and particularly relates to a target nucleus for producing 99 Mo, a production element and a production assembly. BACKGROUND

[0002] 99 Mo is the most important medical radioisotope 99m Tc parent nucleus. 99m Tc has a short half-life (6.02h) and suitable ray energy (140keV), and is very suitable for single photon emission computed tomography (SPECT), and can be labeled with various ligand drugs. Globally, about 40 million people are diagnosed annually by using 99m Tc-labeled drugs for nuclear medicine imaging, accounting for about 70% of all clinical use of radioactive drugs.

[0003] 99 Mo is mainly produced by irradiation of a reactor, production by an accelerator and production by a neutron generator. The production by irradiation of a reactor 99 Mo has a neutron capture 98 Mo(n,γ) 99 Mo and fission 235 U(n,f) 99 Mo in two ways. The former contains a large amount of 98 Mo isotope, and is therefore called carrier 99 Mo, and the latter contains a small amount of Mo isotope, and is therefore called carrier-free 99 Mo. Currently, the global 99 Mo is mainly carrier-free 99 Mo produced by fission in a research reactor, and internationally, carrier 99 Mo produced by a heavy water reactor has been developed, and so far, there is no example of carrier-free 99 Mo produced by a commercial heavy water reactor. SUMMARY

[0004] The present application aims to provide a target nucleus for producing 99 Mo in a heavy water reactor, a production element and a production assembly, and the produced 99 Mo is mainly used in the field of nuclear medical diagnosis.

[0005] The technical scheme of the present application is as follows: a target nucleus for producing 99 Mo in a heavy water reactor, comprising a target tube, a target material layer and a neutron absorber material, the target tube is sleeved with the target material layer, and the two ends of the target tube are respectively connected with inner end plugs, and the target tube is provided with the neutron absorber material.

[0006] The neutron absorber material is a depleted uranium block.

[0007] The depleted uranium slug is arranged in the target tube.

[0008] The neutron absorber material is a zirconium rod coated with a dysprosium coating.

[0009] The zirconium rod is arranged in the target tube.

[0010] A heavy water reactor for producing 99 The target nuclear production element for producing Mo comprises a target nucleus, a cladding tube, a spacer block, a support block and an outer end plug, the target nucleus is arranged in the circular tube-shaped cladding tube, outer end plugs are welded at both ends of the cladding tube to seal the cladding tube, and the outer part of the cladding tube is welded with a spacer block and / or a support block.

[0011] The cladding tube, the spacer block, the support block and the outer end plug are all made of Zr-4 alloy.

[0012] The inner wall of the cladding tube is coated with graphite, and the air gap between the cladding tube and the target nucleus is filled with helium.

[0013] A heavy water reactor for producing 99 The target nuclear production element for producing Mo comprises a production element and an end plate, and the end plate is welded and connected with both ends of the production element.

[0014] The end plate is made of Zr-4 alloy.

[0015] The beneficial effects of the present application are that the present application can produce carrier-free 99 Mo by using a heavy water reactor to produce electricity at the same time, which meets the demand of the nuclear medicine field for 99 Mo. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a heavy water reactor for producing 99 Mo target nucleus production element schematic diagram of the present application;

[0017] Figure 2 is a heavy water reactor for producing 99 Mo target nucleus production target nucleus schematic diagram of the present application using depleted uranium as a neutron absorber;

[0018] Figure 3 is a heavy water reactor for producing 99 Mo target nucleus production target nucleus schematic diagram of the present application using dysprosium as a neutron absorber;

[0019] Figure 4 is a heavy water reactor for producing 99 Mo target nucleus production assembly schematic diagram of the present application;

[0020] Figure 5 is Figure 3 a cross-sectional view.

[0021] In the diagram, 100 is the production component, 1 is the production element, 2 is the end plate, 11 is the target core, 12 is the cladding tube, 13 is the outer end plug, 14 is the support block, 15 is the isolation block, 111 is the target material layer, 112 is the target tube, 113 is the depleted uranium pellet, 114 is the inner end plug, 115 is the dysprosium coating, and 116 is the zirconium rod. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] To achieve the above objectives, the present invention provides a method for producing heavy water reactors. 99 Mo target nuclei are placed in a heavy water reactor to receive neutron irradiation for production. 99 Mo, such as Figure 2 and Figure 3 As shown, it includes a target tube 112, a target material layer 111, and a neutron absorber material, such as... Figure 2 The neutron absorber material shown is depleted uranium pellet 113, such as... Figure 3 The neutron absorber material shown is a zirconium rod 116 coated with a dysprosium coating 115. The target tube 112 is a cylindrical structure, with a target material layer 111 fitted over it. Inner end plugs 114 are connected to both ends of the target tube 112, forming a sealed space with the target tube 112 and the inner end plugs 114 at both ends. Figure 2 As shown, the target tube 112 contains multiple depleted uranium pellets 113, which serve as neutron absorber materials; as Figure 3 As shown, a zirconium rod 116 with an outer dysprosium coating 115 is disposed inside the target tube 112.

[0024] Preferably, the target tube 112 is made of Zr-4 alloy or stainless steel. The target material is electroplated onto the outer surface of the target tube by electrodeposition or other methods, and the target material is selected as... 235 Low-enriched uranium with a U enrichment of 10%-19.95% has a coating thickness of 20-100 μm.

[0025] The neutron absorber material can be depleted uranium or natural dysprosium (Dy).

[0026] Preferably, if the neutron absorber is depleted uranium, a UO2 ceramic core structure is used, with the depleted uranium core loaded inside the target tube. The target tube is open at both ends or sealed by welding with internal end plugs. If the neutron absorber is natural dysprosium, a zirconium rod is designed to be loaded inside the target tube, and the natural dysprosium is coated on the outer surface of the zirconium rod. The target tube is filled with helium gas, and both ends of the target tube are sealed by welding with internal end plugs.

[0027] like Figure 1 As shown, the present invention provides a method for producing heavy water reactors. 99The target nuclear production element 1 of Mo includes a target nucleus 11, a cladding tube 12, a partition block 15, a supporting block 14 and an outer end plug 13, the target nucleus 11 is arranged in the circular tube-shaped cladding tube 12, and the outer end plug 13 is welded at both ends of the cladding tube 12 to seal it. The outer part of the cladding tube 12 is welded with the partition block 14 and the supporting block 15 respectively. The cladding tube 12, the partition block 15, the supporting block 14 and the outer end plug 13 all adopt Zr-4 alloy, the inner wall of the cladding tube 12 is coated with graphite, and the air gap between the cladding tube 12 and the target nucleus 11 is filled with helium.

[0028] As shown in Figure 4 A heavy water reactor production 99 The target nuclear production element 1 of Mo includes a target nucleus 11, a cladding tube 12, a partition block 15, a supporting block 14 and an outer end plug 13, the target nucleus 11 is arranged in the circular tube-shaped cladding tube 12, and the outer end plug 13 is welded at both ends of the cladding tube 12 to seal it. The outer part of the cladding tube 12 is welded with the partition block 14 and the supporting block 15 respectively. The cladding tube 12, the partition block 15, the supporting block 14 and the outer end plug 13 all adopt Zr-4 alloy, the inner wall of the cladding tube 12 is coated with graphite, and the air gap between the cladding tube 12 and the target nucleus 11 is filled with helium. The enrichment of depleted uranium or the loading amount of dysprosium is determined according to the equivalent condition of the production element and the natural uranium fuel element.

Claims

1. A method for producing heavy water reactors 99 The target core of Mo is characterized by: It includes a target tube, a target material layer, and a neutron absorber material. The target tube is fitted with a target material layer, and the two ends of the target tube are connected to inner end plugs. The neutron absorber material is placed inside the target tube. The neutron absorber material is a depleted uranium pellet or a zirconium rod, and the zirconium rod is coated with a dysprosium coating. The depleted uranium core is placed inside the target tube; The zirconium rod is placed inside the target tube; The target tube is made of Zr-4 alloy or stainless steel.

2. A manufacturing element for the target core as claimed in claim 1, characterized in that: It includes a target core, a casing tube, an isolation block, a support block and / or an outer end plug. The target core is placed inside the cylindrical casing tube, and the two ends of the casing tube are welded with outer end plugs to seal it. An isolation block and / or a support block are welded to the outside of the casing tube respectively. The cladding tube, isolation block, support block, and outer end plug are all made of Zr-4 alloy; The inner wall of the cladding tube is coated with graphite, and the air gap between the cladding tube and the target core is filled with helium.

3. A production assembly using the production element of claim 2, characterized in that: It includes a production element and an end plate, with the end plate welded to both ends of the production element; the end plate is made of Zr-4 alloy.

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