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Table 1.3 (continued)
Name
Measurement range of surface
beta-particles flux density
Measurement range of surface
activity of beta-emitting
radionuclides
Indication range of pulse count
rate from beta radiation detector
Energy range of detected beta-
particles
Main relative permissible error
limit during measurement of
surface beta-particles flux density
in the range from 10 to
300 000 part./(cm
90
90
Sr/
Y calibration with 0.95
confidence probability
Main relative permissible error
limit during measurement of
surface activity of beta-emitting
radionuclides in the range from
0.5 to 13500 Bq/cm
calibration with 0.95 confidence
probability from standard source
of С0 type
Area of the detector's sensitivity
Beta-particles detection
efficiency, not less than:
С isotope;
14
- for
204
- for
Tl isotope;
90
90
- for
Sr/
Y isotope
Additional relative permissible
error limit during measurement of
surface beta-particles flux density
and surface activity of beta-
emitting radionuclides caused by
variation of environmental
temperature from –30 to +55
×min) at
2
2
90
90
at
Sr/
Y
о
С
Measurement
unit
×min)
2
part./(cm
2
Bq/cm
cps
MeV
%
%
2
cm
-
%
11
Standardized value
according to the
specification
10– 300 000
0.5 – 13500
for С0
1)
sources type
90
90
(
Sr/
Y)
0 – 9999
0.15 – 3.0
20+200/ F
where F
is a
β
dimensionless
quantity, numerically
equal to surface beta-
particles flux density
value measured in
×
2
part./(cm
min)
20+10/ А
,
β
where А
is
β
dimensionless
quantity, numerically
equal to surface
activity of beta-
emitting radionuclides
value measured in
2
Bq/cm
7
-
-
0.4
5
о
С of
per each 10
deviation from 20
,
β
о
С
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