Radiological
Gem-5 User’s Manual 325
Occupant Specifications
Height of Occupant
The unit has been designed to comfortably monitor users of the height up to 203 cm
(6' 7.9"). Contact factory for situations where the height of potential occupants could
be outside of this range.
Weight of Occupant
The unit has been designed to comfortably monitor users of weight not exceeding
150 kg (330 lbs). Contact factory for situations where the weight of potential
occupants would exceed this value.
Radiological
Radiation Detected
Gamma
Typical Efficiencies
Typical 4π efficiencies at different source/detector distances measured with a 60Co
and then with a 137Cs radioactive point source placed in the center of the detector are
specified in Table 26.
Table 26 GEM-5 Efficiencies
Side/Head Detector Foot Detector
Radioactive
Isotope
Efficiency
Source/Detector
Distance
Efficiency
Source/Detector
Distance
5.2% 20cm [8 in.] 5.8% 20cm [8 in.]
Co 24.2% 5cm [2 in.] 23.4% 5cm [2 in.]
9.6% 20cm [8 in.] 11.8% 20cm [8 in.]
Note that the Figure Of Merit (FOM) technique and a
137
Cs-137 point radioactive
source have been used for reducing signal to noise ratio and defining working
parameter (High Voltage) of detector.
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