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Table 1.2 (continued)
Name
Measurement range of surface
activity of beta-emitting
radionuclides
Indication range of pulse count
rate from beta radiation detector
Energy range of recorded beta
radiation
Main relative permissible error
limit during measurement of
surface beta-particles flux density
in the range from
×min) to
2
10 part./(cm
200 000 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
2
0.5 Bq/cm
to 9000 Bq/cm
90
90
Sr/
Y calibration with 0.95
confidence probability from С0
type source
Area of the detector's sensitivity
Beta-particles recording
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
at
о
С
Measurement
unit
2
Bq/cm
cps
MeV
dimensionless quantity,
%
dimensionless quantity,
%
surface activity of beta-
2
cm
-
%
8
Standardized value
according to the
specification
0.5 – 9 000
for С0
1)
sources type
90
90
(
Sr/
Y)
0 – 9999
0.3 – 3.0
20+200/ F
where F
is a
β
numerically equal to
surface beta-particles
flux density value
measured in
·min)
2
part./(cm
20+10/А
,
β
where А
is a
β
numerically equal to
emitting radionuclides
value measured in
2
Bq/cm
1
-
-
0.25
5
о
С of
per each 10
deviation from 20
,
β
о
С
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