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3.2.9.11 Perform operations 3.2.9.6 - 3.2.9.9 for ABG probe.
3.2.9.12 The control results shall be considered satisfactory if the limit of the
main relative permissible error of measurement of photon-ionizing radiation DER
when measured by the control unit, BG and ABG probes does not exceed 15 %.
3.2.10 The limit of the main relative permissible error of photon-ionizing
radiation DER measurement is controlled as follows:
3.2.10.1 Switch on the dosimeter's control unit, program the values of the DER
and DE gamma radiation threshold levels with zero values.
3.2.10.2 Prepare the dosimeter's control unit for photon-ionizing radiation DE
measurement, reset the control unit's reading relative to the dose.
3.2.10.3 Put the УПГД-3В carriage with the dosimeter's control unit in the
position where the DER from the source with the
= (8 0.8) mSv/h, and simultaneously turn on the stopwatch and feed
H
*
equals
(
10
)
the source to the collimator.
3.2.10.4 After the measurement time of 5 min, write down the DER
measurement result.
3.2.10.5 The control result is considered satisfactory if the limit of the main
relative permissible error of the DE measurement does not exceed 15%.
3.2.11 The limit of the main relative permissible error of measurements of the
surface beta-particle flux density and the surface activity of beta-emitting
radionuclides is controlled as follows:
3.2.11.1 Connect to the dosimeter's control unit to BG probe and enable it to
measure beta-particle flux density. Program the threshold level of sound and light
alarms with zero value, set the limit of statistical deviations of 3%.
3.2.11.2 Place the BG probe with the open beta detector window above the
surface of the reference source of beta radiation type C0 (
with a surface flux density of 1000 to 10,000 part./(cm
work surface is completely above the active surface of the source.
3.2.11.3 If the estimated limit of the expected relative statistical deviations of
the measurement result is less than 3%, make five measurements of beta-particles
flux density. Calculate the average value of beta-particles surface flux density.
3.2.11.4 Calculate the relative main error of the measurement according to the
recommendations of DSTU GOST 8.207-2008.
3.2.11.5 Connect BG probe to the control unit of the dosimeter and perform
operations 3.2.11.1 - 3.2.11.4 for BG probe.
3.2.11.6 The control results are considered satisfactory if the limit of the main
relative permissible error during measurement of beta-particle flux density does not
exceed 20 %.
90
Sr/
×min) so that the detector
2
102
137
Cs radionuclide
90
Y) GOST 27212-87
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