ECOTEST TERRA-P MKS-05 Operating Manual page 38

6.3.5 Evaluation of surface contamination by beta radionuclides
Enter the mode of gamma radiation DER measurement to evaluate surface
contamination by beta radionuclides. Direct the dosimeter with its window, located
opposite the detector (hereinafter the window of the detector), in parallel to the
examined surface and place it as close as possible.
To evaluate surface contamination by beta radionuclides perform two
measurements: the first one should be done with an open window; the second one
with a closed window by a filter-cover. The difference between the first and the
second measurement will be taken as the result of measurement. The difference
between the first and the second measurement is the sign of surface contamination of
the examined object by beta radionuclides. Consider the arithmetic mean of five
measurements in 10 seconds after the beginning of measurement, or any obtained
value when the LCD has stopped blinking, as a result of evaluation of surface
contamination by beta radionuclides. The result will be displayed in µSv/h.
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