VF HF-50 - Page 18

Technical specification
VF1807090083 EN revision 18
Environmental conditions
Range of working temperatures
(0 ÷ +40) °C (32 ÷ +104 °F)
Working relative humidity
max. 90 %, non-condensing
Working pressure
(86 ÷ 106) kPa
Storage conditions
Range of storage temperatures
(-25 ÷ +40) °C (-13 ÷ +104 °F)
Storage relative humidity
max. 90 %, non-condensing
Other storage conditions
The instrument should not be stored without switching on for more than 3 months.
Note on symbols used in the tables below:
× The physical nature of the detector does not allow determination of the parameter.
- The parameter has not been determined yet.
3.1. Surface Contamination Detector SCD-286
Detectors specification
Detected radiation
SCD-286A: Alpha in one channel
SCD-286B: Alpha + Beta in one channel
SCD-286C: Alpha / Beta in two channels
SCD-286D: Alpha + Beta + Gamma in one channel
SCD-286E: Alpha / Beta+Gamma in two channels
Scintillators
SCD-286A: ZnS(Ag) on acrylic glass, 1.5 mm thickness.
Surface density of the scintillator (3.25 ± 0.25) mg∙cm
-2
SCD-286B: plastic scintillator of 0.25 mm thickness
SCD-286C: ZnS(Ag) on a plastic scintillator of 0.25 mm thickness.
Surface density of the scintillator ZnS(Ag) (3.25 ± 0.25) mg∙cm
-2
SCD-286D: plastic scintillator of 5 mm thickness
SCD-286E: ZnS(Ag) on a plastic scintillator of 5 mm thickness.
Surface density of the scintillator ZnS(Ag) (3.25 ± 0.25) mg∙cm
-2
Photomultiplier
Diameter 25 mm with hemispheric window
High voltage source
(400 ÷ 1000) V with sensitive current limitation
Sensitive area of the detector
(130 x 220) mm = 286 cm
2
(44.3 in
2
)
Window
Aluminized light-tight foil (3 x 0.29) mg∙cm
-2
Protective grid
Hexagonal grid, permeability 78 %
Dead time
Automatically compensated, typically 4.6 μs