Eberline ESP-1 - Page 91

Model МЕР
Мешгоп rem Detector
A. GENERAL DESCRIPTION
The Model NRD neutron rem detector is a nine-inch-
diameter, cadmium-loaded polyethelene sphere with a
BF, tube in the center for use as an area monitor. This
detector has been shown to have an energy response
which closely follows the theoretical dose from neutrons
over the energy range from 0.025 eV (thermal) to about
10.00 MeV.' ? The BF, tube allows excellent gamma
rejection. :
В, SPECIFICATIONS
Detector: BF, tube in nine-inch cadmium-loaded
polyethelene sphere.
Plateau: Approximately 200 V with a slope of 5 percent
per 100 V.
Operating Voltage: Dependent on sensitivity of counter
* and cable length. Typically 1600 to 2000 V.
Directional Response: Within +10 percent.
Energy Range: Thermal to approximately 10 MeV.
16
Gamma Rejection: Up to 500 R/h, dependent on high
voltage setting.
Sensitivity: Approximately 50 cpm per mrem per hour
(3000 counts per mrem).
Connector: ΜΗΝ Series coaxial.
Size: 9-inch-diameter x 97/s-inch overall height (22.9
cm X 25.1 cm).
Weight: 13.75 pounds (6.24 kg).
С. AVAILABLE ACCESSORIES
Cable: CA-15-36
Bracket: Wall Mounting Model ZP10478021
' “A Modified Sphere Neutron Detector,” D.E. Hankins,
LA-3595.
2 “The Substitution of a BF, Tube for the Lil Crystal in Neutron
rem Meters", D.E. Hankins: Health Physics Journal; Volume 14,
Number 5, May 1968.
NRD
€ MEASURES NEUTRON DOSE RATE
FROM THERMAL THROUGH FAST
e BF, TUBE GIVES HIGH GAMMA REJECTION