79
3.2.4.3.4 Perform operations 3.2.4.3.2, 3.2.4.3.3 for gamma
radiation DER
)
10
(
0
*
H
= (8.0
0.8) mSv/h. Set the safety threshold
equal to 6 mSv/h. Make measurements in 60 s after the beginning of
irradiation at 60 s interval.
3.2.4.3.5 The device is acknowledged to have passed the
verification test if the main relative permissible error at measurement
for each level of gamma radiation DER does not exceed
(15+1/
)
10
(
*
H
) %, where
)
10
(
*
H
is a measured value of gamma
radiation DER equivalent to μSv/h.
3.2.4.4 Checking the ability to identify the radionuclides and
their categories
3.2.4.4.1 Turn on the device. Turn off sound and vibration alarms
of threshold levels.
3.2.4.4.2 Expose the device’s detector to gamma radiation source
with
137
Cs radionuclide, gamma radiation DER of which makes from
1 to 10 μSv/h. Chose the radionuclide identification mode and start
the identification process. Read the results after automatic
completion of the identification process.
The test should consist of 10 spectrum accumulations and their
identification.
3.2.4.4.3 Repeat 3.2.4.4.2 for
241
Am and
60
Co radionuclides.
3.2.4.4.4 The verification result is acceptable if the device
identifies the radionuclide and its category at least 8 out of 10 times
for each of listed radionuclides.
3.2.4.5 Determination of the main relative permissible error limit
of gamma radiation DE measurement by the built-in GMC.
3.2.4.5.1 To determine the main relative permissible error limit of
gamma radiation DE measurement by the built-in GMC, do the
following: