ComparSUon between thorium and uranium fSUsion track diameters in glass

摘要

ComparSUons between diameters of uranium and thorium neutron induced fSUsion tracks in glass made possible to test indirectly the hypothesSU that observation efficiency of spontaneous U-238 and induced U-235 fSUsion tracks may be considered the same. The sources of fSUsion fragments were uranium and thorium thin films irradiated with neutrons with and without Cd-cover. After irradiation, the glasses were etched for 50 s by HF 24% at 15 degrees C followed by another etching for 30 s in same conditions. Diameters were meaSUred after each chemical etching. Only tracks presenting a ratio between the longer and shorter diameters lesser than 1. 1 have been analyzed. The reSUlts indicates the hypothesSU SU valid.