VF HF-50 - Page 19

Technical specification
VF1807090083 EN revision 19
Radiometric parameters
Parameter
Detector
Measurement range
Detector background
Measurement ranges
(for background 100 nGy/h)
SCD-286A
4 cps to 100 kcps
< 0.1 cps, typically 0.04 cps
SCD-286B
6 cps to 100 kcps
< 20 cps, typically 10 cps
SCD-286C (alpha)
4 cps to 100 kcps
< 0.2 cps, typically 0.08 cps
SCD-286C (beta)
6 cps to 100 kcps
< 20 cps, typically 10 cps
SCD-286D
15 cps to 100 kcps
< 75 cps, typically 37 cps
SCD-286E (alpha)
4 cps to 100 kcps
< 0.3 cps, typically 0.14 cps
SCD-286E (beta + gamma)
15 cps to 100 kcps
< 75 cps, typically 37 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-286C, SCD-286E
< 30 %, typically 6 %
Overload
Indication of overload when the measurement range is exceeded up to 100 x the
upper limit.
Affecting radiation
Detector
SCD-286A
SCD-286B
SCD-286C
SCD-286D
SCD-286E
Channel
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)]
-
1.2
.
10
2
-
9.9
.
10
1
1.1
.
10
3
-
1.1
.
10
3