The NRF31 Electronic Personal Dosimeter, EPD measures personal exposure of neutron and gamma radiation: dose and dose rate. The NRF31 features digital display and audible alarm. The user sets alarm threshholds for dose and dose rate by means of the NRZ software and reader.

Radiation Measured: Gamma (X) rays and Neutron
Detector: Silicon semiconductor
Measurement Range: Gamma(X) rays : ≤ ± 10%
(0.1mSv to 9.999Sv (10mrem to 999.9rem),137Cs)
Neutron : ≤ ± 15%
(0.5mSv to 9.999Sv (50mrem to 999.9rem), 252Cf)
Accuracy: Gamma(X) rays : ≤ ± 10%
(0.1mSv to 9.999Sv (10mrem to 999.9rem),137Cs)
Neutron : ≤ ± 15%
(0.5mSv to 9.999Sv (50mrem to 999.9rem), 252Cf)
Energy Range: Gamma(X) rays : 30keV to 6MeV
Neutron : 0.025eV to 15MeV
Energy Response: Gamma(X) rays : ≤ ± 20% (50keV to 6MeV, 137Cs reference)
Neutron : ≤ ± 50% (250keV to 4.5MeV, 241Am-Be reference)
Angular Response: Gamma(X) rays :
≤ ± 20% (Up to ±60degree vertical and horizontal, 137Cs)
≤ ± 50% (Up to ±60degree vertical and horizontal, 241Am)
≤ ± 30% (All around horizontal, 137Cs, free air)
Neutron :
≤± 30% (Up to ±75degree vertical and horizontal, 241Am-Be)
Dose Rate Linearity: Gamma(X) rays : ≤ ±10%
(0.1mSv/h to 9.999Sv/h (10mrem/h to 999.9rem/h), 137Cs)
Neutron : ≤ ± 20%
(0.5mSv/h to 9.999Sv/h (50mrem/h to 999.9rem/h), 252Cf)
Display: LCD (with backlight)
Alarm Volume: 85 to 100dB (at 30cm)
Communication Method: Infrared communication
Operating Temperature: -20℃ to 50℃ (-4°F to 122°F)
Operating Humidity: 35% to 95%RH (Non-condensing)
Power Supply: Primary Battery (CR123A) x 1
Battery Life: 2880hours (without alarm/ communication)
Dimensions: 60(W) x 33(D) x 78(H)mm
(2.4(W) x 1.3(D) x 3.1(H) in)
Weight: 120g approx. (0.26lb approx.)