ECOTEST STORA-TU RKS-01, Operating Manual, Page: 109 / 132

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3.2.4.4 Calculation of main relative error of surface beta-particles flux
density measurement
Prepare the radiometer for photon-ionizing radiation DER measurement and
program 5 % value of the specified statistical error according to item 2.3.3.6 of the
OM.
Wait until the statistical error of external background DER measurement results
goes down to the value of not more than 15 %.
Then switch the radiometer to the mode of surface beta-particles flux density
measurement, and set 10 % value of the specified statistical error according to item
2.3.3.7 of the OM.
Remove the beta-filter cover from the gamma and beta radiation detector. Place
the radiometer above the 4CO source surface, providing surface beta-particles flux
density from 50 to 150 part./(cm
2
·min), so that the work surface of the detector is
placed completely over the active surface of the source.
Wait until the statistical error of surface beta-particles flux density
measurement results goes down to the value of not more than 15 %.
Then register five measurement results with 5 s interval, calculate the average
value of surface beta-particles flux density and the main relative error of
measurement.