103
Note.
With positive results of controlling the limits of the main relative
permissible error of measurements of surface flux density of beta- and alpha-
particles, the control of the main relative permissible error limit of measurement of
surface activity of beta- and alpha-emitting radionuclides is not carried out. This
happens because surface flux density of beta-particles and surface activity of beta-
emitting radionuclides, as well as surface flux density of alpha-particles and surface
activity of alpha-emitting radionuclides are measured by the same detectors and the
transition from surface density to surface activity is carried out by multiplying the
measurement result by an appropriate factor.
3.2.12 Control of the limit of the main relative permissible error of
measurements of surface alpha-particle flux density and surface activity of alpha-
emitting radionuclides is as follows:
3.2.12.1 Connect ABG probe to the dosimeter’s control unit and switch it on to
the mode of measurement of alpha-particle flux density. Program the threshold level
of sound and light alarms with zero value, specified limit of statistical deviations -
3%.
3.2.12.2 Place ABG probe with an open alpha detector window above the
surface of the standard alpha-radiation source of P9 type (
239
Pu) GOST 27212-87
with a surface flux density of 1000 to 10,000 part./(cm
2
×min) so that the detector's
working surface was completely above the active surface of the source.
3.2.12.3 If the estimated limit of the expected relative statistical deviations of
the measurement result is less than 3%, make five measurements of alpha-particles
surface flux density. Calculate the average value of alpha particles surface flux
density.
3.2.12.4 Calculate the main relative error of measurement according to the
recommendations of the method provided in DSTU GOST 8.207-2008.
3.2.12.5 The control results are considered satisfactory if the limit of main
relative permissible error during measurement of alpha-particles surface flux density
does not exceed 15%.
3.2.13 Presentation of verification results.
3.2.5.1 Positive results of periodic or after-repair verification are recorded in the
Table 13.1 of the logbook or by issuing a verification certificate for the legislatively
regulated measurement equipment.
3.2.5.2 If the dosimeter is acknowledged unfit for use after its verification, it gets
the certificate of inadequacy.
Summary of Contents for MKS-UM
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