ECOTEST MKS-05 TERRA Operating Manual page 69

2.3.3.9 The mode surface beta-particles flux density measurement
This mode can be entered from any other operating mode of the
dosimeter with the help of a short press of the MODE button. This mode
follows the mode of measured value indication of photon-ionizing radiation
DE and DE accumulation time.
At first measure gamma background DER (to enable its further
automatic subtraction), and then measure surface beta-particles flux density.
To do this, place the dosimeter in the mode of DER measurement (filter
cover covers the window of the detector) over the surface that should be
examined for beta-particles flux density, and wait for the measurement
result of gamma background DER with the required statistical error. Press
shortly the MODE button twice. This will store the measured value of
gamma background DER and switch the dosimeter from photon-ionizing
radiation DER measurement mode to surface beta-particles flux density
measurement mode.
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