Energy calibration of a BC501A liquid scintillator using a γ-γ coincidence technique

• Published in: Chinese physics C Vol. 34; no. 7; pp. 993 - 997
• Main Author: 言杰 刘荣 李澄 蒋励 鹿心鑫 朱通华
• Format: Journal Article
• Language: English
• Published: IOP Publishing 01.07.2010; Department of Modern Physics,University of Science and Technology of China,Hefei 230026,China; Institute of Nuclear Physics and Chemistry,Chinese Academy of Engineering Physics,Mianyang 621900,China%Institute of Nuclear Physics and Chemistry,Chinese Academy of Engineering Physics,Mianyang 621900,China%Department of Modern Physics,University of Science and Technology of China,Hefei 230026,China
• Subjects: γ-γ符合; γ-射线; 二次多项式; 康普顿电子; 液体闪烁; 能量分辨率; 能量刻度; energy calibration; BC501A liquid scintillator; γ-γ coincidence
• ISSN: 1674-1137; 0254-3052; 2058-6132
• DOI: 10.1088/1674-1137/34/7/012

An accurate energy calibration of a BC501A liquid scintillator by means of Compton scattering of γ-rays is described.The energy resolution and the position of the Compton edge have been precisely determined using a γ-γ coincidence technique and fitting the coincidence spectrum with a Gaussian function superimposed on a quadratic polynomial for the background.The position of the Compton edge relative to the position of the maximum and the half height of the distribution in dependence on the relevant energy resolution is discussed in detail.The results indicate that the maximum energy of the recoil Compton electron does not occur at the half height distribution but at 0.90±0.05 of the maximum height in the energy range considered.The energy resolution varies from 15.6% to 8.02% for electrons in the energy region from 0.5 MeV to 3 MeV.