Chinese Physics C > 2012, Vol. 36 > Issue(11): 1082-1088 DOI: 10.1088/1674-1137/36/11/008

Conditioning theγspectrometer for activity measurement at very high background

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The application of a high purity Germanium (HPGe) γspectrometer in determining the fuel element burnup in a future reactor is studied. The HPGe detector is exposed by a ⁶⁰Co source with varying irradiation rate from 10× 10 ³m s ^-1to 150× 10 ³m s ^-1to simulate the input counting rate in real reactor environment. A ¹³⁷Cs and a ¹⁵²Eu source are positioned at given distances to generate a certain event rate in the detector with the former being proposed as a labeling nuclide to measure the burnup of a fuel element. It is shown that both the energy resolution slightly increasing with the irradiation rate and the passthrough rate at high irradiation level match the requirement of the real application. The influence of the background is studied in the different parameter sets used in the specially developed procedure of background subtraction. It is demonstrated that with the typical input irradiation rate and ¹³⁷Cs intensity relevant to a deep burnup situation, the precision of the ¹³⁷Cs counting rate in the current experiment is consistently below 2.8%, indicating a promising feasibility of utilizing an HPGe detector in the burnup measurement in future bed-like reactors.

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YAN Wei-Hua, ZHANG Li-Guo, ZHANG Zhao and XIAO Zhi-Gang. Conditioning the γspectrometer for activity measurement at very high background[J]. Chinese Physics C, 2012, 36(11): 1082-1088. doi: 10.1088/1674-1137/36/11/008

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Received: 2012-02-24
Revised: 1900-01-01

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通讯作者:陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Conditioning theγspectrometer for activity measurement at very high background

Corresponding author:XIAO Zhi-Gang,

Received Date:2012-02-24

Accepted Date:1900-01-01

Available Online:2012-11-05

Abstract:The application of a high purity Germanium (HPGe)γspectrometer in determining the fuel element burnup in a future reactor is studied. The HPGe detector is exposed by a⁶⁰Co source with varying irradiation rate from 10× 10³m s^-1to 150× 10³m s^-1to simulate the input counting rate in real reactor environment. A¹³⁷Cs and a¹⁵²Eu source are positioned at given distances to generate a certain event rate in the detector with the former being proposed as a labeling nuclide to measure the burnup of a fuel element. It is shown that both the energy resolution slightly increasing with the irradiation rate and the passthrough rate at high irradiation level match the requirement of the real application. The influence of the background is studied in the different parameter sets used in the specially developed procedure of background subtraction. It is demonstrated that with the typical input irradiation rate and¹³⁷Cs intensity relevant to a deep burnup situation, the precision of the¹³⁷Cs counting rate in the current experiment is consistently below 2.8%, indicating a promising feasibility of utilizing an HPGe detector in the burnup measurement in future bed-like reactors.

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Conditioning theγspectrometer for activity measurement at very high background

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