Neutron Dose Rate Meter

Features
• 22.9 cm (9 in.) Moderated Neutron Detector
• Range: 0–100 mSv/h (0–10,000 mrem/hr)
• Gamma Rejection up to 0.1 Sv/h (10 R/hr)
• Ratemeter with Built-in Scaler Function
•  Independent Adjustable Alarms for
RATEMETER and SCALER Modes
• RS-232 Connection

Meter Specifcations
DISPLAY: LCD with programmable backlight on time
POWER: two each “D” cell batteries
BATTERY LIFE: typically 200 hours
CONTROLS: Off/Ratemeter/Scaler three-position operation switch, Audio on/off switch, Fast/Slow response witch, LCD backlight pushbutton, Count Reset pushbutton, and Scaler Count pushbutton
AUDIO: built-in audio [greater than 60 dB at 0.6 meters (2 ft)] speaker with On/Off switch
SCALER TIME: adjustable from 1–999999 seconds, can display seconds or minutes
ALERT/ALARM: pre-programmed alarms for ratemeter and scaler modes
RS-232: “D” type connector, used for programming instrument and outputting data at two-second intervals, baud rate from 150–19.2k bps
SIZE: 16.5 x 8.9 x 21.6 cm (6.5 x 3.5 x 8.5 in.) (H x W x L)
WEIGHT: 1.6 kg (3.6 lb)

Detector Specifcations
DETECTION RANGE: thermal to approximately 12 MeV
ENERGY RESPONSE: approximately follows the inverse of the radiation protection guide curve for neutron dose
DETECTOR: 2 Atm ³He tube LND 25185 or equivalent
MODERATOR: 22.9 cm (9 in.) diameter cadmium-loaded polyethylene sphere
SENSITIVITY: typically 30 cpm per mrem/hr (241 AmBe fast neutrons); 100 cpm per mrem/hr(moderated 252 Cf)
GAMMA REJECTION: typically 10 cpm or less through 100 mSv/h (10 R/hr) (137Cs)
OPERATING VOLTAGE: approximately 1200 Vdc
INPUT SENSITIVITY: -2 mV
CONNECTOR: series “C” (others available)
TEMPERATURE RANGE: -20 to 50 °C (-4 to 122 °F)
SIZE: 26.2 x 22.9 x 22.9 cm (10.3 × 9.0 × 9.0 in.) (H x W x D), including brackets