VF HF-50 - Page 21

Technical specification
VF1807090083 EN revision 21
Radiometric parameters
Parameter
Detector
Measurement range
Detector background
Measurement ranges
(for background
100 nGy/h)
SCD-525A
4 cps to 100 kcps
< 0.25 cps, typically 0.12 cps
SCD-525B
6 cps to 100 kcps
< 40 cps, typically 20 cps
SCD-525C (alpha)
4 cps to 100 kcps
< 0.25 cps, typically 0.12 cps
SCD-525C (beta)
6 cps to 100 kcps
< 40 cps, typically 20 cps
SCD-525D
15 cps to 100 kcps
< 160 cps, typically 80 cps
SCD-525E (alpha)
4 cps to 100 kcps
< 0.30 cps, typically 0.15 cps
SCD-525E (beta + gamma)
15 cps to 100 kcps
< 160 cps, typically 80 cps
Displayed quantities
Pulse rate [cps], activity [Bq], surface activity [Bq.cm
-2
]
Relative intrinsic error
±25 %
Reference radionuclide
241
Am (alpha),
36
Cl (beta)
Time constant
Variable (3 ÷ 10) s
Homogeneity
The minimum response must be greater than half the maximum response measured across
the entire sensitive area of the detector, i.e. the deviation must be less than 50 %, typically
25 %.
Crosstalk from alpha
channel to beta (beta-
gamma) channel, for
types SCD-525C, SCD-
525E
< 30 %, typically 15 %
Overload
Indication of overload when the measurement range is exceeded up to 100 x the upper limit.
Affecting radiation
Detector
SCD-525A
SCD-525B
SCD-525C
SCD-525D
SCD-525E
Chanel
alpha
alpha
+beta
alpha
beta
alpha+beta
+gamma
alpha
beta
+gamma
Alpha (
241
Am) [cps/Bq]
×
×
×
-
×
×
-
Beta (
90
Sr+
90
Y) [cps/Bq]
-
×
-
×
×
-
×
Gamma (
137
Cs)
[cps/(μGy/h)]
-
1.9.10
2
-
2.1.10
2
2.2.10
3
-
2.5.10
3