Determination of the dead-layer thickness for both p- and n-type HPGe detectors using the two-line method

In this work, an approach for determining both the outer dead layer thickness of the p-type coaxial HPGe detector and the inner dead layer thickness of the n-type coaxial HPGe detector was proposed by using two full energy peak area count ratios of a X-ray and a gamma ray emitted from the same radio...

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Bibliographic Details
Published in:Journal of radioanalytical and nuclear chemistry 2018-01, Vol.315 (1), p.95-101
Main Authors: Loan, Truong Thi Hong, Ba, Vu Ngoc, Thy, Truong Huu Ngan, Hong, Huynh Thi Yen, Huy, Ngo Quang
Format: Article
Language:English
Subjects:
Analysis
Cesium isotopes
Chemistry
Chemistry and Materials Science
Computer simulation
Detection equipment
Diagnostic Radiology
Energy consumption
Gamma rays
Hadrons
Heavy Ions
Inorganic Chemistry
Methods
Monte Carlo methods
Nuclear Chemistry
Nuclear Physics
Physical Chemistry
Rapid prototyping
Sensors
Thickness
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Summary:In this work, an approach for determining both the outer dead layer thickness of the p-type coaxial HPGe detector and the inner dead layer thickness of the n-type coaxial HPGe detector was proposed by using two full energy peak area count ratios of a X-ray and a gamma ray emitted from the same radioisotope of 137 Cs. Monte Carlo calculations and experimental measurements were conducted to determine these dead layer thicknesses. The results showed that the outer dead layer thickness reached 0.57 ± 0.03 mm on 06 Jan 2017 after nearly 3 years of use for the p-type detector. The inner dead layer thickness reached 1.21 ± 0.24 mm on 01 Aug 2016 after more than 3 years of operation for the n-type detector. Simulation model with the modified dead layer thicknesses was used to estimate full energy peak efficiencies and gamma spectra from seven radioactive sources. The results were in good agreement with the corresponding experimental values in the gamma energy region of interest.
ISSN:0236-5731
1588-2780
DOI:10.1007/s10967-017-5637-8