Ludlum Medical Physics Model 42-31H
9" Moderated Neutron Radiation
Detector
Introduction
The Model
42-31H is a 9" REM ball type neutron radiation detector designed to be used with
portable counting instruments. It includes a top mounted bracket that
facilitates mechanical connection directly to a portable instrument's case. It
is designed for detection of thermal and fast neutrons (0.025 eV to
approximately 12 MeV).
The 42-31H detector consists of a 3He detector (1.6 cm diameter x
2.5 cm thick), surrounded by a cadmium-loaded polyethylene sphere, 22.9 cm
(9 inches) in diameter. A study is available that shows that the 9-inch
cadmium-loaded sphere has a response similar to that of a 10-inch diameter rem-responding
sphere.
Specifications
PART NUMBER: 4005-140
DETECTOR: 2 Atm ³He tube LND 25185 or equivalent
Moderator: 9" (22.9 cm)
diameter cadmium-loaded polyethylene sphere
Sensitivity: Typically 120
cpm/mrem/hr (241AmBe fast neutrons)
Gamma Rejection: Typically
10 cpm or less through 10 R/hr (100 mSv/hr) (137Cs)
Detection Range: Thermal
to approximately 12 MeV
Energy Response: Thermal
to 7 MeV follows the inverse of the radiation protection guide curve for neutron
dose
Input Sensitivity: -2 mV
Compatible Instruments:
Typically used with portable counting instruments (capable of achieving -2 mV
input sensitivity)
Operating Voltage:
Typically 1000 – 1200 volts
Connector: Series “C”
(others available)
Size: 10.25" H × 9" W × 9"
D, (26.5 x 22.9 x 22.9 cm) including brackets
Temperature Range: 5°F to
122°F (-150 to 500 C)
Weight: 6.54 kg (14.42
lbs.)
Other Ludlum Medical Physics Products
Ludlum Medical Physics Information
For more information or to request a quotation,
please contact us
by phone at: (865)
947-5123 or by email at:
sales@deqtech.com.
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