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Radiation Protection Dosimetry Advance Access originally published online on April 21, 2006
Radiation Protection Dosimetry 2006 121(3):310-316; doi:10.1093/rpd/ncl041
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

In situ gamma-ray spectrometry for environmental monitoring: a semi empirical calibration method

Jonas Boson1,*, Kenneth Lidström1, Torbjörn Nylén1, Göran Ågren1 and Lennart Johansson2

1 Swedish Defence Research Agency, FOI NBC-skydd, SE 901 82 Umeå, Sweden
2 Department of Radiation Sciences, Umeå University, SE 901 87 Umeå, Sweden

* Corresponding author. jonas.boson{at}foi.se

Received December 15, 2005, amended March 6, 2006, accepted March 17, 2006


  Abstract

In situ gamma spectrometry using high-purity germanium (HPGe) detectors is a frequently used method for the determination of radionuclide ground deposition levels. Such measurements do, however, require an efficiency calibration based on detector sensitivity and parameters such as soil density and vertical activity distribution. In this work, a novel expression is used for the detector efficiency, incorporating both the influence of photon energy and incidence angle. Detector-specific efficiency data are determined empirically. For the theoretical calculation of the photon fluence at the detector, a three-layer model of finite thickness is developed for the description of soil density and vertical activity distribution. In order to facilitate the calibration of in situ measurements, a PC program has been developed to enable rapid, on-site calculations of radionuclide ground deposition levels. The semi empirical calibration method was tested on in situ measurements with two different detectors, and the results show good agreement with results obtained from traditional soil sampling.


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J. Boson, L. Johansson, H. Rameback, and G. Agren
Uncertainty in HPGe detector calibrations for in situ gamma-ray spectrometry
Radiat Prot Dosimetry, June 1, 2009; 134(2): 122 - 129.
[Abstract] [Full Text] [PDF]


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