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Prepare the radiometer for measurement of surface alpha-particles flux density
in accordance with section 2.3.3.8 of this OM.
Program the value of the specified limit of statistical deviations equal to 3%.
With the installed Cover No.3 (alpha, filter) measure and save the values of gamma
and beta radiation component, the estimated limit of statistical deviations of the
result of this measurement should not exceed 15%. After memorizing the gamma,
beta component, it is necessary to replace Cover No.3 with Cover No.4 (grid).
Place the radiometer above the surface of 4П9 source, which provides a surface
alpha-particles flux density of 50,000 part./(cm
such a way that the working surface of the detector is completely located above the
active surface of the source.
Wait for the reduction of the estimated limit of statistical deviations of
measurement results of surface alpha-particles flux density to a value not
exceeding 3 %.
·min) to 100,000 part./(cm
2
121
·min) in
2
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