quantulus gct6220與1220的比較1姜國華

InstituteofNuclearandNewEnergyTechnology(INET),TsinghuaQuantulusGCT6220與Quantulus1220的比較 2Quantulus1220與GCTQuantulusQuantulusGCT 3Quantulus1220112354鉛銅Quantulus1220QuantulusGCT6220與TriCarb3180（帶BGOGuard）GCT（GuardCompensationACTUALEVENTS=DETECTEDEVENTS/ 5QuantaSmart 包含名叫“”的方法，優(yōu)化結(jié)果文件673個非淬滅標準樣品：blk、3H、20mL塑料瓶（均加入10mLOptiPhaseHiSafe3個空白：blk1、blk2、1對α/β甄別樣品：241Am、1對檢查反符 影響樣品：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、外標準源：1+1（GCT6220）；5+5（Quantulus8標稱活度GCT參數(shù)（GCT

factorfactorfactor9

3H

14C

Coincidencebias:low（H-法）,high（C-14法）(甄別閾

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

PulseShapePulseShape Wallac1414的PSA定義：慢組分/快組分（0-255）優(yōu)

QuantulusGCT6220使用的

Quantulus

GCT

QuantulusGCTQuantulusGCTQuantulusGCT 0

塑料瓶本底（GCT塑料瓶本底（GCTQuantulusGCT6220是新儀器，而Quantulus1220已服役了11年，探測器和Guard探測器的信號符合概率較高，這樣被反符合屏蔽兩種液閃儀的本底隨著儀器參數(shù)的設(shè)置不同互有高低；兩種液閃儀的計數(shù)效率隨著儀器參數(shù)的設(shè)置和待測核素衰變特性的不同互有高低。待測核素的衰變特性會影響主探測器和探測器的信號符合概率。對s 0，甄別閾設(shè)置越高，本底和計asT，對3H、14C、241Am，QuantulusGCT6220的計數(shù)效率較高；對60Co、90Sr/90Y，Quantulus1220的計數(shù)效率較高；對137Cs，當而變。在淬滅水平相當于10mLOptiPhaseHiSafe3中加入0.3mL淬件下，Quantulus 1220的誤計率較??；在較高淬滅條件下，QuantulusGCT6220的誤計率較小。QuantulusGCT6220的GCT參數(shù)只作用于β道計數(shù)，對α道計數(shù)沒有影響。正因為此，QuantulusGCT6220α道本底都比Quantulus1220高。 簡單的原理性介紹，缺乏詳細技術(shù)資料，如何更好地設(shè)置QuantulusGCT6220的GCT參數(shù)，還有待進一步研究。AlphacountsAlphacountsper239+240PuRelativeRelativecountsperchannelAlphacountsper圖A237Np/233Alphacountsper

圖B237Np、238-240Pu、241Am的α譜圖（當拖尾影響小時放廢液中這兩種核素是β放射性的主要圖C238-240Pu的α譜 lg gSS/Ig

600700800gEg

液閃表觀計數(shù)效率

0

CountrateCountrateperunitmassina-Countrateperunitmassina-86420

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

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