ECOTEST MKS-UM, Руководство по эксплуатации, Страница: 13 / 119

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