An accelerator-based 99 mo subcritical production device and method
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An accelerator-driven, production-device technology, applied in radiation-transforming chemical element devices, reactor/accelerator external conversion, nuclear engineering, etc., can solve problems such as high cost and complicated process, and achieve reduction of radioactive waste, simple post-processing, increased The effect of large reaction chances
Active Publication Date: 2021-01-05
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-driven 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 sequentially from the output direction. The target 13 in the central target cavity 14 of S2 produces neutron emission;
[0038] The irradiation production unit S2 is a concentric cylindrical structure, which sequentially includes a neutron moderator layer 20, a neutron multiplication layer 21, a low-enrichment uranium salt solution 22, a neutron reflection layer 23, and a shielding layer 24 from the inside to the outside; , the low-enrichment uranium salt solution 22 is placed in the fission reaction vessel 25 and sealed, and the emitted neutrons generated by the target 13 in the target cavity 14 pass through the neutron moderator layer 20 and t...
Embodiment 2
[0048] Embodiment 2 also discloses an accelerator-driven 99 Mo subcritical production method, comprises the following steps:
[0049] First, the accelerator unit generates accelerated particle beams (proton beams or deuterium ion beams) to bombard heavy nuclear targets (lead, mercury, tungsten), or gaseous deuterium targets (or tritium targets) in the target chamber, heavy nuclear fission occurs, or deuterium The deuterium fusion (or deuterium-tritium fusion) reaction emits neutrons;
[0050] The high-energy neutrons generated above enter the neutron moderator layer around the target chamber, and part of them are moderated to the thermal neutron area. 235 U has a larger fission cross section; wherein, 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 moderator layer enters the neutron multiplication layer I, and the material of this layer is bismuth, or l...
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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 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 every year 99m For Tc inspection, the demand is about 110,000 Ci / week, accounting for more than 80% of the isotopes used in the field of nuclear medicine. 99m Tc is mainly obtained by irradiating highly enriched uranium (High Enriched Uranium, HEU) in the experimental reactor 99 The Mo isotope decays to . 99m The half-life of Tc is only 6.6h, so the nuclear medicine industry usually uses longer half-life 99 Mo (its half-life is about 66h) is purified, transported and stored for future use, thus 99 The stability of Mo supply directly determines 99m Market supply of Tc. [0003] traditional 99 Mo production methods include reactor fission method and...
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Patent Type & Authority Patents(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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