Place the radiometer above the 4CO source surface, providing surface beta-
particles flux density from 1000 to 10000 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 10 %. Then register
five measurement results in the protocol with 5 s interval.
Calculate the average value of surface beta-particles flux density and the main
relative error of measurement.
Place the radiometer above the 4CO source surface, providing surface beta-
particles flux density from 50000 to 100000 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 10 %. Then register
five measurement results in the protocol with 5 s interval.
Calculate the average value of surface beta-particles flux density and the main
relative error of measurement.
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