摘要
描述了一种可同时测量两个样品中总α总β的低本底测量仪。它的测量系统采用新型ST-1221型低本底αβ闪烁体和低噪声CR120型光电倍增管组成主探测器,由一块200mm×30mm的ST-401型塑料闪烁体和CR119型光电倍增管作为反符合探测器。仪器对于90Sr-90Yβ源的2π效率比≥60%时,本底≤0.07cm-2·min-1;对于239Puα源的2π效率比≥80%时,本底≤0.0017cm-2·min-1。仪器对于总α的灵敏度为5～20mBq/L,对于总β的灵敏度为10～40mBq/L。
This report describes an α and β radiation detection system capable of counting emissions from two samples simultaneously. Thin plastic phosphors and zinc sulphide phosphors are used as primary detectors, shielded against background radiation by a single plastic scintillator guard detector coupled in anticoincidence with the primary detectors. 239Pu α counting efficiency is 72% with a background of 1.59 counts per hour.90Sr90Y β counting efficiency is 45% with a background of 1.11 counts per minute.
出处
《核电子学与探测技术》
CAS
CSCD
北大核心
2003年第4期337-342,共6页
Nuclear Electronics & Detection Technology
