VF HF-50 - Page 23

Technical specification
VF1807090083 EN revision 23
Radiometric parameters
Parameter
Detector
Measurement range
Detector background
Measurement ranges
(for background 100
nGy/h)
SFP-100A
4 cps to 100 kcps
< 0.1 cps, typically 0.05 cps
SFP-100B
6 cps to 100 kcps
< 10 cps, typically 5 cps
SFP-100C (alpha)
4 cps to 100 kcps
< 0.1 cps, typically 0.05 cps
SFP-100C (beta)
6 cps to 100 kcps
< 10 cps, typically 5 cps
SFP-100D
15 cps to 100 kcps
< 60 cps, typically 30 cps
SFP-100E (alpha)
4 cps to 100 kcps
< 0.2 cps, typically 0.1 cps
SFP-100E (beta + gamma)
15 cps to 100 kcps
< 40 cps, typically 18 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 (2 - 30) 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
SFP-100C, SFP-100E
< 30 %, typically 5 %
Overload
Indication of overload when the measurement range is exceeded up to 100 x the upper
limit.
Affecting radiation
Detector
SFP-100A
SFP-100B
SFP-100C
SFP-100D
SFP-100E
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)]
7.2
.
10
-5
5.8
.
10
1
6.8
.
10
-3
4.6
.
10
1
4.9
.
10
2
7.1
.
10
-2
4.8
.
10
2