Publication date: January 2018
Source:Journal of Environmental Radioactivity, Volume 181
Author(s): Alan J. Cresswell, David C.W. Sanderson, Katsuhiko Yamaguchi
A Monte Carlo simulation was used to develop a model of the response of a portable gamma spectrometry system in forest environments. This model was used to evaluate any corrections needed to measurements of 137Cs activity per unit area calibrated assuming an open field geometry. These were shown to be less than 20% for most forest environments. The model was also used to assess the impact of activity in the canopy on ground level measurements. For similar activity per unit area in the lower parts of the canopy as on the ground, 10-25% of the ground based measurement would be due to activity in the canopy, depending on the depth profile in the soil. The model verifies that an optional collimator cap can assess activity in the canopy by repeat survey.
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Πέμπτη 2 Νοεμβρίου 2017
Assessment of the calibration of gamma spectrometry systems in forest environments
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