YALINA-booster subcritical assembly pulsed-neutron e xperiments: detector dead time and apatial corrections.

Cao, Y. ; Gohar, Y. ; Nuclear Engineering Division

关键词: CONFIGURATION;    COUNTING RATES;    DEAD TIME;    NEUTRONS;    PROBABILITY;   

DOI  :  10.2172/993695
RP-ID  :  ANL-10/31
PID  :  OSTI ID: 993695
Others  :  TRN: US1008146

学科分类：物理（综合）

美国|英语

来源: SciTech Connect

【 摘 要 】

In almost every detector counting system, a minimal dead time is required to record two successive events as two separated pulses. Due to the random nature of neutron interactions in the subcritical assembly, there is always some probability that a true neutron event will not be recorded because it occurs too close to the preceding event. These losses may become rather severe for counting systems with high counting rates, and should be corrected before any utilization of the experimental data. This report examines the dead time effects for the pulsed neutron experiments of the YALINA-Booster subcritical assembly. The nonparalyzable model is utilized to correct the experimental data due to dead time. Overall, the reactivity values are increased by 0.19$ and 0.32$ after the spatial corrections for the YALINA-Booster 36% and 21% configurations respectively. The differences of the reactivities obtained with He-3 long or short detectors at the same detector channel diminish after the dead time corrections of the experimental data for the 36% YALINA-Booster configuration. In addition, better agreements between reactivities obtained from different experimental data sets are also observed after the dead time corrections for the 21% YALINA-Booster configuration.