BS ISO 18589-1:2005: Measurement of radioactivity in the by BSI

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Extra info for BS ISO 18589-1:2005: Measurement of radioactivity in the environment. Soil. Part 1: General guidelines and definitions

Example text

An example of a sample sheet and a model of the description and location of a profile are given in Annex B. 4 Transport and storage of samples The packaged samples and their sample sheets should be transported as quickly as possible to the laboratory to await analysis. Transport and storage conditions shall be such as to avoid all contamination of the material. The transport and preservation temperatures of the samples should be specified [16], [17], [18] where necessary, in the test report.

3 Investigations of accidents and incidents When an area is likely to be contaminated following an accident, surface sampling should be carried out as soon as technically feasible on the whole of the suspect area, taking into account the radiation protection principles. The objective is to determine the extent of the horizontal contamination and, in the event of heterogeneous diffuse pollution (source points identified), the resulting activity gradient. NOTE As a measure of preparedness for an accident or incident, particularly suitable sampling units around facilities can be selected in advance to allow for adequate sampling immediately after an event.

NOTE One of the aspects of this initial investigation is also to assess the risks of exposure of workers in charge of the sampling operation and, therefore, to define radiation protection measures, in particular those to be implemented onsite relating to the protection of personnel against radiation. In routine surveillance of a nuclear installation, the sampling unit may be chosen as the point of maximum concentration of the predicted fallout of gaseous discharges from the plant. When the radioactivity of the soil and other components of the environment (air, water, bio-indicators, elements of the human food chain) is investigated simultaneously, then the selection of the sampling unit should take into account the presence of the other indicators.

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