摘要
阐述了用 Rossi-α法测量瞬发中子衰减常数α的基本原理、测试方法及条件。用 BF3计数管作为探测器 ,采用时间延迟符合的测量方法 ,测量得出了实验室快临界装置在缓发临界时的瞬发中子衰减常数 αc,其值为 0 .835( 1± 0 .5% ) μs-1,并在次缓发临界以下 0～ 1＄次临界度范围内测得多个点的 α值 ,通过外推再次得到 αc,二者在误差范围内一致。最后给出 :αc=0 .835± 0 .0 0 4
The Rossi α technique is described to determine the prompt neutron decay constantα. This technique uses BF 3 detector ,through the time delay coincident technique,to measure the prompt neutron decay constant of a fast critical facility. αc is equal to 0.835±0.004μs -1 . In the subcriticality range of 0 1$,the results ofαfrom different position are measured andαc can be extrapolated from theseα values.The results which are determined from two methods are consistent within the error.
出处
《核电子学与探测技术》
CAS
CSCD
北大核心
2001年第4期268-270,260,共4页
Nuclear Electronics & Detection Technology
