title: RBE of CF-252 neutrons by mouse testes weight loss.
abstract: Mouse testes weight decreased with increasing radiation dose following exposure to Cf-252 and its mixed neutron plus gamma radiation. The dose response for low dose rate (LDR) Cf-252 followed two components on an exponential plot of log percent weight loss vs. dose. Similar dose-response relationships were observed for acute 60Co or LDR Cs-137 radiations, but these required much larger doses to produce the same effect. The RBE was calculated against acute 60Co and Cs-137. There were no differences between acute 60Co and LDR Cs-137 effects. Cf-252 neutron RBE (n + gamma) was 3.7 for testes weight loss. RBEn for the neutrons-only was 5.1 RBE for the radiosensitive portion was 4.0.
mesh_terms: D000818:Animals; D002142:Californium; D002588:Cesium Radioisotopes; D003037:Cobalt Radioisotopes; D005214:Fast Neutrons; D005720:Gamma Rays; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D009929:Organ Size / Q000187:drug effects; D011829:Radiation Dosage; D012062:Relative Biological Effectiveness; D013737:Testis / Q000528:radiation effects*
chemical_list: D002588:Cesium Radioisotopes; D003037:Cobalt Radioisotopes; D002142:Californium