M00000338
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ISO 18589-7 1st Edition, October 1, 2013 Measurement of radioactivity in the environment - Soil - Part 7: In situ measurement of gamma-emitting radionuclides
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Availability date: 07/13/2021
Description / Abstract:
This part of 18589 specifies the identification of radionuclides
and the measurement of their activity in soil using in situ gamma
spectrometry with portable systems equipped with germanium or
scintillation detectors.
This part of ISO 18589 is suitable to rapidly assess the
activity of artificial and natural radionuclides deposited on or
present in soil layers of large areas of a site under
investigation.
This part of ISO 18589 can be used in connection with
radionuclide measurements of soil samples in the laboratory (ISO
18589-3) in the following cases:
— routine surveillance of the impact of radioactivity released
from nuclear installations or of the evolution of radioactivity in
the region;
— investigations of accident and incident situations;
— planning and surveillance of remedial action;
— decommissioning of installations or the clearance of
materials.
It can also be used for the identification of airborne
artificial radionuclides, when assessing the exposure levels inside
buildings or during waste disposal operations.
Following a nuclear accident, in situ gamma
spectrometry is a powerful method for rapid evaluation of the gamma
activity deposited onto the soil surface as well as the surficial
contamination of flat objects.
NOTE The method described in this part of ISO 18589 is not
suitable when the spatial distribution of the radionuclides in the
environment is not precisely known (influence quantities, unknown
distribution in soil) or in situations with very high photon flux.
However, the use of small volume detectors with suitable
electronics allows measurements to be performed under high photon
flux.