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2.5.2 Important
measurement
Attention: Failure to adhere to the following recommendations may lead
to incorrect measurement results.
This section provides recommendations on measurement of specific/volume
activity of radioactive cesium on the example of food. Best practices for testing of
soil and timber are the same. You may also view these recommendations in the
help window (see Fig. 2.6).
Before starting testing the food products it is strongly recommended to find
a place with a low background level – not more than 0.15 µSv/h. Higher radiation
background may distort measurement results. To measure background, use
VIRTUOSO in the mode of gamma radiation dose rate measurement.
2.5.2.1 Preparing a food product for testing
1 The food packaging (container) may be made of any kind of material. In
the case of a metal container, its thickness should not exceed 1 mm.
2 Do not mix food products of different types for testing (since different
food types cannot be equally contaminated). For instance, do not mix mushrooms
with fish. The product should be of homogeneous consistency.
However, it is possible to carry out a study of a basket with different types
of products, if you need to make a rapid assessment of the presence or absence of
contamination among the collected products. In such a case, a correct measurement
is impossible, but you may still search for contamination this way.
recommendations
Figure 2.26 – Uniformity of product types
for
specific/volume
47
activity
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