公开(公告)号：US3796876A

公开(公告)日：1974-03-12

申请号：US3796876D

申请日：1972-01-10

Applicant: INTERATOM

Inventor： KRINNINGER H ,  WIESNER S

IPC: G01N23/207 ,  G21C17/06 ,  G01T1/20 ,  G01T3/00

CPC classification number: G21C17/063 ,  G01N23/2073

Abstract: Device for non-destructively and separately determining concentrations of fissionable material in a test specimen includes a heavy moderator formed of lead having a given slowingdown time and having means for receiving a test specimen therein, means for irradiating the test specimen with neutrons so as to effect nuclear fissions producing prompt fission neutrons therein and for producing in the moderator a pulse of monoenergetic fast neutrons of short duration compared to the given slowing-down time of the moderator, and detector means including at least one recoil proton counter for determining, over various time intervals, in accordance with different mean energies of the irradiating neutrons being slowed-down in the moderator, the number of prompt fission neutrons produced in the test specimen.