Neutron-capture therapy apparatus and method

Details Neutron-capture therapy apparatus and method Neutron-capture therapy apparatus and method

A - Human Necessities

61

N

A61N 5/00 (2006.01) A61N 5/10 (2006.01) G21C 1/02 (2006.01)

Patent

CA 2153059

Patient treatment rooms (27) are circularly spaced around a nuclear reactor core (16, 17, 18). Shielding (22) provided between the rooms and the core, has neutron transmission sageways (23) from the core for appropriate collimating equip- ment. The core is cylindrical and multi-regional, with the inner two (16, 17) or three (16, 17, 18) regions containing nuclear fuel the inner core (16) producing most of the fission neutrons, the first core ring (17) containing a low enrichment fuel, and the third (18) containing thorium or depleted uranium metal or some other heavy metal for inelastic scattering of neutrons and gamma ray absorption. Two moderator rings (19, 20), each con- taining a different moderator liquid composition with variable thermal neutron absorbers and gamma ray absorbers, surround the multi-regional core. A heavy metal gamma ray shield (21) surrounds the second moderator ring. The arrangement con- stricts the neutron spectrum in the reactor itself to transmit only epithermal neutrons to patients, without typical spectrum shap- ing filters.

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