7
Table 3.1 continued
3.13
Limits of permissible additional relative DER
measurement error must be no more than:
when ambient air temperature changes from
normal to -20°С, and from normal to +50 °С;
at ambient air relative humidity 95 % at
35 °С;
when power supply voltage changes from
nominal to extreme during photon radiation DER
measurement;
at exposure of 400 A/m magnetic-field
strength
during
photon
radiation
DER
measurement;
at radiofrequency magnetic fields effect
during photon radiation DER measurement;
10 %
10 %
10 %
10 %
10 %
3.14
BDG1 with set
n
coefficient value at which instrument false operations rate is no more than
one event during 10 min of continuous operation, and gamma background level no higher than
0.25 μSv/h, detects standard radioactive sources (SS) and alternative gamma sources, according to
Table 3.1.1, with probability more than 0.5
Table 3.1.1
Source type
Parameter name
133
Ba
137
Cs
60
Co
Gamma source activity, kBq (μCi),
30%
55.0 (1.5)
100.0 (2.7)
50.0 (1.35)
Movement speed (source/instrument), m/s
0.5
0.05
0.5
0.05
0.5
0.05
Distance between the source and detector’s
sensitive surface, m
0.2
0.005
0.2
0.005
0.2
0.005
3.15
Quantity of accumulation channels of gamma radiation
scintillation spectra
1024
3.16
Energy resolution at scintillation spectra registration by
0.662 MeV (
137
Cs), no more than
8.5 %
3.17
Limit of permissible main error of conversion response
(integral nonlinearity) when registering scintillation spectra, no
more than
0.5 %
3.18
Maximum input statistical load of the BDG1 when
registering scintillation spectra, no more than
75
10
3
с
-1
3.19
Data exchange with BDOI or PC
USB or RS-485
