|
KMID : 0371819700020010009
|
|
Nuclear Engineering and Technology
1970 Volume.2 No. 1 p.9 ~ p.17
|
|
|
A Semi-Empirical Efficiency Curve For a Thin Ge(Li) Detector At Low Energies
|
|
Chung, M.K.
Suh, D.W./Cho, S.W/Kim, E.G.
|
|
|
Abstract
|
|
|
|
Recently several workers tried semi-empirical approach to the determination of the relative total-energy-peak efficiency,, ,x-, in the low gamma-ray energy range. They adopted the semi-empirical formula E´ oc,,F-+Ao exp(-BE), where -F-and o - are photoelectric and Compton absorption coefficients respectively, E is the gamma-ray energy and A and B are constants determined from the measured values of detction efficiencies. In spite of the good fit to the experimental curve by this forynular for higher energies, this curve deviates considerably from measured values in the range, E <500-600 keV. By the accurate analysis of our experimental data, we found that the formula, ccA?exp(-BE), which are independent of the absorption coefficients, can account experimental data more accurately in the energy range, E> 700 keV. For lower energies than 700 keV, the formula, ("; is-T7 +AuE-B), shows excellent agreement with the observed data. Our results show the results show the contribution from multiple Comption scattering to the total energy peak varies with the energies as A a exp (-BE) for higher energies and as A o E-B for lower energies. It is also proved the formula A ?exp (-BE) can be deduced from the .Y-+A a exp(-BE) in case of thin detector. Utilizing our experimental results, intensity ratios of Au´98 and In "s^ gamma-rays are re-calibrated and resulted r, (411.795 keV) /r2 (675.88 keV) /; (1087.69 keV)=100/0.85±0.056/0.218±0.021 for Au´us and r, (138.32keV)/ r2 (417.0 keV)/r3 (818.80 keV)/ ra (1097.20 keV) /r; (1293.30)keV)=(3.00±0.41)/(20.94±1.46)/ (10.98±1.14)/61.82±6.26),´80 for In"G"´ gamma-rays.
|
|
|
KEYWORD
|
|
|
|
|
|
FullTexts / Linksout information
|
|
|
|
|
|
Listed journal information
|
|
|
|
|