101
Note.
The distance between the mechanical center of the source and the
mechanical center of the detector is considered to be the distance between the
mechanical center of the source and the plane perpendicular to the direction of
gamma quanta beam propagation, and passes through the mechanical center of the
detector in that plane.
3.2.9.3 Put the УПГД-3B carriage with the control unit in a position where
gamma radiation DER from a source containing
137
Cs radionuclide is
= (8
0.8) mSv/h. After reducing the estimated limit of statistical deviations
of the measurement results up to 3%, record five photon-ionizing radiation DER
measurements at a 5 s interval in the report. Calculate the average DER value
by the formula (3.1).
(3.1)
3.2.9.4 Calculate the main relative permissible error limit of DER measurement
as a percentage according to the recommendations of the methods contained in
DSTU GOST 8.207-2008.
3.2.9.5 Connect the BG probe to the dosimeter’s control unit. Turn on the
dosimeter and switch it into the mode of photon-ionizing radiation DER
measurement. Program the DER threshold level with zero value, the specified limit
of statistical deviations - 3%.
3.2.9.6 Secure the BG probe on the carriage of the УПГД-3B standard
equipment so that the mechanical center of the УПГД-3B collimator coincides with
the mechanical center of the detector labaled by "+" symbol.
3.2.9.7 Place the УПГД-3B carriage with the BG probe in a position where
photon-ionizing radiation DER from
137
Cs source is
= (800
80) µSv/h and
after reducing the estimated limit of statistical deviations of the measurement results
up to 3%, record five measured DER values at a 5 s interval in the report. Calculate
the average DER value by the formula (3.1).
3.2.9.8 Calculate the main relative permissible error limit of photon-ionizing
radiation DER measurement as a percentage according to the recommendations of
the methods contained in DSTU GOST 8.207-2008.
3.2.9.9 Perform operations 3.2.9.6 - 3.2.9.8 for DER
= (20
0.8) µSv/h.
3.2.9.10 Connect the ABG probe to the dosimeter’s control unit. Turn on the
dosimeter and switch it into the mode of photon-ionizing radiation DER
measurement. Program the DER threshold level with zero value, the specified limit
of statistical deviations - 3%
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Содержание MKS-UM
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