<99>Mo sub-critical production device and method based on accelerator driving
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An accelerator-driven, production device technology, which is applied in radiation-converting chemical element devices, reactor/accelerator external conversion, nuclear engineering, etc., can solve problems such as high cost and complex process, achieve reduction of radioactive waste, simple post-processing, and avoidance of Effects of nuclear proliferation risk
Active Publication Date: 2020-01-17
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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[0008] In order to overcome the disadvantages and defects of the existing complex process, high cost, nuclear proliferation, etc., the present invention provides an accelerator-driven 99 Mo subcritical production device and method, induced by irradiating low-enriched uranium salt solution 235 U fission occurs 235 U(n,f) reaction to prepare medical radioisotopes 99 Mo
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Embodiment 1
[0036] See Figure 1-2 : An accelerator-based drive of this embodiment 99 Mo subcritical production device, including accelerator unit: S1, irradiation production unit S2, and separation and purification unit S3;
[0037] The accelerator unit S1 includes a high-energy particle source 10, a collimator 11, an accelerator 12, a target 13, and a target cavity 14, from the output direction. The high-energy particle source 10 passes through the collimator 11 and the accelerator 12 to accurately bombard the irradiation production unit. The target 13 in the target cavity 14 in the center of S2 generates neutron emission;
[0038] The irradiation production unit S2 is a concentric cylindrical structure, which includes a neutron moderation layer 20, a neutron multiplier layer 21, a low-enriched uranium salt solution 22, a neutron reflection layer 23, and a shielding layer 24 from the inside to the outside. , The low-enriched uranium salt solution 22 is placed in the fission reaction vessel ...
Embodiment 2
[0048] This embodiment 2 also discloses an accelerator-based 99 The Mo subcritical production method includes the following steps:
[0049] First, the accelerator unit generates an accelerated particle beam (proton beam or deuterium ion beam) to bombard a heavy nuclear target (lead, mercury, tungsten), or a gaseous deuterium target (or tritium target) in the target chamber, causing heavy nuclear fission, or deuterium Deuterium fusion (or deuterium-tritium fusion) reaction emits neutrons;
[0050] The high-energy neutrons generated above enter the neutron moderation layer surrounding the target chamber, and part of them are slowed down to the thermal neutron zone. 235 U has a larger fission cross-section; among them, the moderator layer material used is polyethylene, or water, or heavy water, or graphite, or beryllium, or zirconium hydride;
[0051] The neutron beam passing through the moderating layer enters the neutron multiplication layer I, which is made of bismuth, or lead, or le...
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Abstract
The invention discloses a <99>Mo sub-critical production device and method based on accelerator driving. The <99>Mo sub-critical production device based on accelerator driving comprises an acceleratorunit, a radiation production unit and a separation and purification unit; the accelerator unit sequentially comprises a high-energy particle source, a collimator, an accelerator, a target and a target cavity in an output direction; the high-energy particle source accurately bombards the target positioned in the target cavity at the center of the radiation production unit through the collimator and the accelerator to generate neutron; the radiation production unit adopts a concentric cylindrical structure and sequentially comprises neutron slowing layer, a neutron multiplying layer, a low enriched uranium salt solution and a neutron reflecting layer from inside to outside; and the low enriched uranium salt solution is placed into a fission reaction container to be sealed, the reflecting neutron generated by the target in the target cavity passes through the neutron slowing layer and the neutron multiplying layer to obtain high neutron flux and react with the low enriched uranium salt solution, the solution after reaction enters the separation and purification unit through a pipeline, and the neutron reflecting layer and a shielding layer are arranged sequentially from inside to outside, are positioned on an outer layer and are used for reducing neutron loss.
Description
Technical field [0001] The present invention relates to the technical field of isotope production, in particular to an accelerator-driven 99 Mo subcritical production device and method. Background technique [0002] 99m Tc is currently one of the most widely used medical radioisotopes, used by more than 40 million people worldwide each year 99m Tc is used for examination, and the demand is about 110,000 Ci / week, which accounts for more than 80% of the isotopes used in the nuclear medicine field. 99m Tc is mainly obtained by irradiating High Enriched Uranium (HEU) in the experimental reactor 99 Mo isotope decays. 99m The half-life of Tc is only 6.6h, so the nuclear medicine industry usually uses a longer half-life 99 Mo (its half-life is about 66h) is purified, transported and stored for later use, so 99 The stability of Mo supply directly determines 99m Market supply of Tc. [0003] traditional 99 Mo production methods include reactor fission method and neutron activation method. T...
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Patent Type & Authority Applications(China)
IPC IPC(8): G21G1/10
CPCG21G1/10G21G2001/0036
Inventor 李春京韩运成柳伟平黄群英王芳
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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