UCRLDetermination of the standard deviation on multiplication based on count distributions

Verbeke, J

Lawrence Livermore National Laboratory

关键词: Statistics;    Neutrons;    Thermal Neutrons;    22 General Studies Of Nuclear Reactors;    Helium;   

DOI  :  10.2172/1010410
RP-ID  :  LLNL-TR-414591
RP-ID  :  W-7405-ENG-48
RP-ID  :  1010410

美国|英语

来源: UNT Digital Library

【 摘 要 】

The multiplication M of a multiplying object can be determined by analyzing the arrival times of thermal neutrons in detectors such as helium tubes. A source emitting neutrons randomly will lead to neutron inter arrival times obeying Poisson process statistics. By observing how the inter arrival times of detected counts differ from Poisson statistics, one can assess properties of the neutron source such as the source intensity and multiplication. While the method of analyzing the inter arrival times of neutrons using count distributions to determine characteristics of the source has been used for a long time, the treatment of the errors on the determined quantities multiplication M and source strength S have not yet been adequately treated. This object of this report is to assess these errors.