US PATENT SUBCLASS 976 / DIG 429
.~.~ Using multiple collimators (e.g., Bucky screens); other devices for eliminating undesired or dispersed radiation [G21K-1/02B]


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976 /   HD   NUCLEAR TECHNOLOGY

DIG 427  DD  ARRANGEMENTS FOR HANDLING RADIATION OR PARTICLES (e.g., focusing, moderating [G21K-1/00] *** (radiation filters DIG. 435) {6}
DIG 428  DD  .~ Using diaphragms, collimators [G21K-1/02] {2}
DIG 429.~.~ Using multiple collimators (e.g., Bucky screens); other devices for eliminating undesired or dispersed radiation [G21K-1/02B]