Models 375-31H Area Monitor with Neutron Detector
Section 3
Ludlum Measurements, Inc.
Page 3-4
January 2021
Detector
Detector:
2 atm ³He tube LND 25185 or equivalent
Moderator:
22.9 cm (9 in.) diameter cadmium-loaded polyethylene sphere
Compatible Instruments:
typically used with portable counting
instruments (capable of achieving -2 mV input sensitivity)
Sensitivity:
100 cpm/mrem/hr (
241
AmBe fast neutrons)
Gamma Rejection:
10 cpm or less through 10 R/hr (100 mSv/hr) (
137
Cs)
Detection Range:
thermal to approximately 12 MeV
Energy Response:
thermal to 12 MeV, follows the radiation protection
guide curve for neutron dose
Input Sensitivity:
-2 mV
Operating Voltage:
approximately 1200 V
Connector:
series “C” (others available)
Temperature Range:
-20 to 50 °C (-4 to 122
°
F)
Size:
26 x 22.9 x 22.9 cm (10.3 x 9 x 9 in.) (H x W x D), including
brackets
Weight:
6.6 kg (14.5 lb)
