分类： 物理学 >> 核物理学 提交时间： 2025-04-27
Lu, Dr. JiFei
Song, Dr. Lin
Zhu, Dr. Lihua
Yun, Prof. Zheng
PANG, Miss Xuan
Qi, Dr. Hao-tian
Kong, Dr. DeXing
Sun, Dr. Bao-Hua
Li, Mr. Tian-Xiao
Xiaoguang, Prof. Wu
Li, Dr. Cong-Bo
LU, Dr. Jing-Bin
摘要： An anti-coincidence shielding γ-ray detector has been designed to study Compton suppression and cosmic rays anti-coincidence based on a LaBr3(Ce)/CsI(Tl) phoswich scintillator, where the LaBr3(Ce) scintillator is chosen as the main crystal completely surrounded by the CsI(Tl) scintillator. Since the differences in their pulse shapes, a series of studies have been conducted using pulse shape analysis (PSA) methods. By using digital charge integration (QDC), the energy resolutions of the detector are obtained, being 3.7% for 662 keV of 137Cs , 3.1% for 1173 keV and 2.8% for 1332 keV of 60Co after excluding the influence of cascade γ rays. This detector can suppress the Compton continuum by 2∼5 times for 137Cs/60Co based on Fast and Slow Component Ratios (FCR-SCR). Furthermore, almost all cosmic rays can be rejected by filtering events above 10 MeV in an in-beam spectrum analysis. It clearly shows that this anti-coincidence shielding γ-ray detector can be used for low level radioactivity measurements as well as high energy γ rays measurements.
分类： 物理学 >> 核物理学 提交时间： 2025-03-30
Lu, Dr. JiFei
Zhu, Dr. Lihua
Yun, Prof. Zheng
PANG, Miss Xuan
Qi, Dr. Hao-tian
Song, Dr. Lin
Kong, Dr. DeXing
Sun, Dr. Bao-Hua
Li, Mr. Tian-Xiao
Xiaoguang, Prof. Wu
Li, Dr. Cong-Bo
LU, Dr. Jing-Bin
摘要： An anti-coincidence shielding γ-ray detector has been designed to study Compton suppression and cosmic rays anti-coincidence based on a LaBr3(Ce)/CsI(Tl) phoswich scintillator, where the LaBr3(Ce) scintillator is chosen as the main crystal completely surrounded by the CsI(Tl) scintillator. Since the differences in their pulse shapes, a series of studies have been conducted using pulse shape analysis (PSA) methods. By using digital charge integration (QDC), the energy resolutions of the detector are obtained, being 3.7% for 662 keV of 137Cs , 3.1% for 1173 keV and 2.8% for 1332 keV of 60Co after excluding the influence of cascade γ rays. This detector can suppress the Compton continuum by 2∼5 times for 137Cs/60Co based on Fast and Slow Component Ratios (FCR-SCR). Furthermore, almost all cosmic rays can be rejected by filtering events above 10 MeV in an in-beam spectrum analysis. It clearly shows that this anti-coincidence shielding γ-ray detector can be used for low level radioactivity measurements as well as high energy γ rays measurements.
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