quantulus gct6220与1220的比较1姜国华

InstituteofNuclearandNewEnergyTechnology(INET),TsinghuaQuantulusGCT6220与Quantulus1220的比较 2Quantulus1220与GCTQuantulusQuantulusGCT 3Quantulus1220112354铅铜Quantulus1220QuantulusGCT6220与TriCarb3180（带BGOGuard）GCT（GuardCompensationACTUALEVENTS=DETECTEDEVENTS/ 5QuantaSmart 包含名叫“”的方法，优化结果文件673个非淬灭标准样品：blk、3H、20mL塑料瓶（均加入10mLOptiPhaseHiSafe3个空白：blk1、blk2、1对α/β甄别样品：241Am、1对检查反符 影响样品：60Co、添加量（mL）：0、0.1、0.2、0.4、0.8、1.2、

HNO31.0mol/LNa18.3g/LFe6.0Al5.7Ni2.9g/LNd1.5g/L空白：60；241Am、90Sr/90Y：5；3H、14C：10；60Co、外标准源：1+1（GCT6220）；5+5（Quantulus8标称活度GCT参数（GCT

factorfactorfactor9

3H

14C

Coincidencebias:low（H-法）,high（C-14法）(甄别阈

Eβ(keV)Eβ(keV)Iβ317.90EEce=624.218-661.644keV,ΣIce=γ1γ2EβEβ Iβ 661.657γ84.99%ce137mBa

PulseShapePulseShape Wallac1414的PSA定义：慢组分/快组分（0-255）优

QuantulusGCT6220使用的

Quantulus

GCT

QuantulusGCTQuantulusGCTQuantulusGCT 0

塑料瓶本底（GCT塑料瓶本底（GCTQuantulusGCT6220是新仪器，而Quantulus1220已服役了11年，探测器和Guard探测器的信号符合概率较高，这样被反符合屏蔽两种液闪仪的本底随着仪器参数的设置不同互有高低；两种液闪仪的计数效率随着仪器参数的设置和待测核素衰变特性的不同互有高低。待测核素的衰变特性会影响主探测器和探测器的信号符合概率。对s 0，甄别阈设置越高，本底和计asT，对3H、14C、241Am，QuantulusGCT6220的计数效率较高；对60Co、90Sr/90Y，Quantulus1220的计数效率较高；对137Cs，当而变。在淬灭水平相当于10mLOptiPhaseHiSafe3中加入0.3mL淬件下，Quantulus 1220的误计率较小；在较高淬灭条件下，QuantulusGCT6220的误计率较小。QuantulusGCT6220的GCT参数只作用于β道计数，对α道计数没有影响。正因为此，QuantulusGCT6220α道本底都比Quantulus1220高。 简单的原理性介绍，缺乏详细技术资料，如何更好地设置QuantulusGCT6220的GCT参数，还有待进一步研究。AlphacountsAlphacountsper239+240PuRelativeRelativecountsperchannelAlphacountsper图A237Np/233Alphacountsper

图B237Np、238-240Pu、241Am的α谱图（当拖尾影响小时放废液中这两种核素是β放射性的主要图C238-240Pu的α谱 lg gSS/Ig

600700800gEg

液闪表观计数效率

0

CountrateCountrateperunitmassina-Countrateperunitmassina-86420

(x10000g- (x10000g- 8 y=y=ax3+bx2+cx+d拐点（PSA=82.2拐点（PSA=82.2a-CountratesperCountratesperchannel

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