Precise efficiency calibration of an HPGe detector up to 3.5 MeV, with measurements and Monte Carlo calculations.
Previously we used relative and absolute efficiency measurements combined with Monte Carlo calculations to define the efficiency of an HPGe gamma-ray detector with 0.2% accuracy from 50 to 1400 keV. This work has been extended to 4.8 MeV with measurements of relative efficiencies from 24Na, 56Co, and 66Ga sources. The combined results of experiment and calculation yield an efficiency curve up to 3.5 MeV with 0.4% accuracy. Single- and double-escape peak contributions also agree with calculation if positron annihilation-in-flight is incorporated.
Idaho National Engineering and Environmental Laboratory, Idaho Accelerator Center, Idaho State University, P.O. Box 1625, Pocatello, Idaho Falls, ID 83415-2114, USA. helmerr@pcif.net
R G
RG
Helmer
N
N
Nica
J C
JC
Hardy
V E
VE
Iacob
D000465:Algorithms; D002138:Calibration; D019544:Equipment Failure Analysis; D005720:Gamma Rays; D005857:Germanium / Q000528:radiation effects*; D015233:Models, Statistical; D009010:Monte Carlo Method; D011786:Quality Control; D011874:Radiometry / Q000295:instrumentation* / Q000379:methods* / Q000592:standards; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014159:Transducers
D005857:Germanium