Model 44-157, 44-159, 44-159-1, 44-162
Gamma Pipe Monitors
Ludlum Measurements, Inc.
Page 3
September 2016
Specifications
Scintillator:
44-157:
5.1 x 5.1 cm (2 x 2 in.) (Dia x thickness),
NaI (Tl) crystal
44-159 & 44-159-1:
18 x 18 mm (0.7 x 0.7 in.) CsI
(Tl) crystal
44-162:
7.6 x 7.6 cm (3 x 3 in.) NaI (Tl) crystal
Compatible Instruments
: general-purpose survey meters,
ratemeters and scalers
Sensitivity
:
44-157:
900 cpm/µR/hr (
137
Cs gamma)
44-159 & 44-159-1:
120 cpm/µR/hr
44-162:
2300 cpm/µR/hr
Energy Range
:
44-157:
60 keV to 3 MeV
44-159 & 44-159-1:
50 keV to 3 MeV
44-162:
60 keV to 3 MeV
Background:
44:157:
9750 cpm
44-159 & 44-159-1:
750 cpm
44-162:
2200 cpm
Operating Voltage
:
44-157:
500-1200 Vdc
44-159 & 44-159-1:
700-1200 Vdc
44-162:
500-1200 Vdc
Dynode String Resistance
:
44-157:
60 megohm
44-159 & 44-159-1:
100 megohm
44-162:
60 megohm
Efficiency:
44-157:
57
Co is 11%;
137
Cs is 5%; and
60
Co is 10%
44-159 & 44-159-1:
57
Co is 14%;
137
Cs is 3%; and
60
Co is 5%
44-162:
125
I is 29%
