Thermal neutron beam shaping device

Abstract

A thermal neutron beam shaping device disclosed by the invention comprises a proton channel and a device body arranged at the rear end of the proton channel. The proton channel is provided with a linear inner cavity channel, and a target body is arranged in the proton channel. The device body comprises a reflector and moderators, the moderators are arranged at the tail end of the proton channel, and the reflector is arranged on the periphery of the proton channel and the moderators. The moderators comprises a middle moderator and a rear moderator, the middle moderator is arranged at the rear end of the proton channel, and the rear surface of the middle moderator abuts against and is connected with the front surface of the rear moderator. By adopting the middle moderator, when neutrons enter the rear moderator, the energy of most of the neutrons is close to 10keV or lower than 10keV, so that the content of high-energy neutrons higher than 10keV is reduced.

Description

technical field [0001] The invention relates to the technical field of BNCT boron neutron capture therapy, in particular to a thermal neutron beam shaping device for treating superficial tumors. Background technique [0002] The energy coverage of the neutron beam used by the BNCT device for treatment is <0.5eV-10keV. After entering the human body, the neutrons are then captured by the highly enriched boron-10 atoms in tumor cells, releasing charged particles and killing tumor cells . There are many types of tumors that BNCT is suitable for treating, which can be divided into superficial tumors and deep tumors. The depth of the tumor is different, and the required neutron beam energy is also different. Deep tumors require high-energy epithermal neutron beams (0.5eV-10keV) for treatment, while superficial tumors require low-energy thermal neutrons (<0.5eV) for treatment. [0003] Based on the thermal neutron beam energy used to treat superficial tumors, the thermal ne...

AI Technical Summary

Problems solved by technology

All in all, while high-energy neutrons are not moderated at all, there are already a large number of thermal neutrons reacting with hydrogen in the moderator, colliding and absorbing them. However, due to the large absorption cross-section of hydrogen materials, if high-energy neutrons Complete moderation requires a larger hydrogen-containing moderator, and a larger hydrogen-containing moderator is easy to absorb a large number of thermal neutrons, and the solution to this technical problem is just around the corner; Most radiation protection designs use lead as the gamma shielding material, but lead has a large elastic scattering of neutrons. Although it can effectively shield gamma rays, it also greatly reduces the neutron flux at the exit.

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