Radiation Protection Dosimetry Advance Access originally published online on August 4, 2008
Radiation Protection Dosimetry 2008 131(4):455-468; doi:10.1093/rpd/ncn204
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Measurements and Monte Carlo calculations of photon energy distributions in MAYAK PA workplaces
1 MAYAK PA, Lenin street 31, 456780 Ozyorsk, Russia
2 Department of Electrical and Computer Engineering, Aristotle University of Thessaloniki, GR-54124 Thessaloniki, Greece
3 Universite Pierre et Marie Curie (Paris VI), U.F.R. Physique BC212, 4 Place Jussieu, 7525 Paris cedex 05, France
4 Greek Atomic Energy Commission, GR-15310 AgiaParaskevi, Athens, Greece
* Corresponding author: clouvas{at}eng.auth.gr
Received March 31, 2008, amended July 1, 2008, accepted July 13, 2008
Photon energy distributions were measured in different workplaces of the Mayak Production Association (MPA), which was the first plutonium production plant in the former Soviet Union. In situ gamma spectrometry measurements were performed with a portable germanium detector. The spectral stripping method is used for the conversion of the in situ gamma-ray spectra to photon fluence rate energy distribution. This method requires the simulation of the portable germanium detector, which has been performed based on the MCNP code of Los Alamos. Measured photon fluence rate energy distributions were compared with calculated photon energy distributions (with the MCNP code) in two different workplaces: in the first workplace the geometry exposure was known. On the contrary, in the second workplace, as in most workplaces of MPA, the exposure geometry was unknown. The results obtained from the comparison between the experimental and calculated photon fluence rate energy distributions are presented and discussed.