23
Table 5.2
Names of the reference
and auxiliary verifica-
tion tools
Main metrological and technical charac-
teristics
Verification procedure chapter num-
ber at
primary verifica-
tion
periodic verifica-
tion
Reference verification
assembly with
137
Cs
sources set, according to
local government stand-
ards
DER measurement range from
0.1 μSv/h to 10 Sv/h.
Accuracy of the assembly calibration
no more than ± 6 % at confidence
probability 0.95
5.8.3.1,
5.8.3.2
5.8.3.1,
5.8.3.2
Reference gamma do-
simeter
DER measurement range of the exter-
nal gamma background from 0.1
μSv/h to 10 Sv/h. Accuracy of the
assembly calibration no more than ± 3
% at confidence probability 0.95
5.8.3.1
5.8.3.1
Thermometer
Scale interval 1
С. Measurement
range 10 - 40
С
5.6.1
5.6.1
Barometer
Scale interval 1 kPa. Measurement
range 60 - 120 kPa. Intrinsic error no
more than 0.2 kPa
5.6.1
5.6.1
Hydrometer
Relative air humidity measurement
range 30 - 90 %. Measurement accu-
racy no more than ± 5 %
5.6.1
5.6.1
Gamma dosimeter
DER measurement range of the exter-
nal gamma background from 0.1 to
10 μSv/h. Permissible intrinsic rela-
tive measurement error no more than
± 15 %
5.6.1
5.6.1
Seconds counter
Scale interval 0.1 s
5.8.3.1,
5.8.3.2
5.8.3.1,
5.8.3.2
Water phantom
30x30x15 cm*
5.8.3.1,
5.8.3.2
5.8.3.1,
5.8.3.2
*A plane-parallel PMMA phantom 30x30x15 cm can be used
5.4 Verification Officers Qualification Requirements
5.4.1 Only persons certified as state verification officers in accordance with established pro-
cedure are allowed to conduct measurements during verification and (or) to analyze measurement
results.
5.5 Safety Requirements
5.5.1 Any works with radioactive sources must be done according to state and local safety
instructions for radioactive sources and other ionizing radiation sources valid at the verification site.
The verification process should be considered as work under special conditions.
5.6 Verification Conditions
5.6.1 Instrument verification is carried under normal environmental conditions:
- ambient air temperature
(20
5)
С;
- relative air humidity
60 (+20; -30) %;
- atmospheric pressure
101.3 (+5.4; -15.3) kPa;
- external gamma background radiation
no more than 0.2 μSv/h.
