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General Specification
8.1
NOTE: UOM can be changed to rem.
Model
: NRF51
Detector
: Silicon semi-conductor
Radiation type
: γ(X) rays (30 keV to 7.0 MeV) and neutron (0.025 eV to 15 MeV)
Dose display range: 0 uSv to 10 Sv, 0 uSv/h to 10 Sv/h for gamma
Gamma effective measurement range: 20 uSv to 10 Sv, 0.5 uSv/h to 10 Sv/h (accumulated dose)
Neutron effective measurement range: 500 uSv to 10 Sv, 5 uSv/h to 10 Sv/h (accumulated dose)
Rated range
: Gmha-Na (category for IEC61526)
Indication error
: Within ±10 % (Cs-137, 20 uSv to 10 Sv)
Within ±15 % (Cf-252, 500 uSv to 10 Sv)
Energy characteristic
Direction characteristic
Energy and direction response: Relative response 0.71 to 1.67 (60 keV to 6 MeV, 0° to 60°) for gamma
Temperature characteristic: Within ±5 % (20 °C, -10°C to +50°C, outdoor use possible)
Water proof
: IP65/67
Pollution degree : 2
Dimensions
: approx. 105 mm(H) × 60 mm(W) × 29/21.8 mm(D) (excluding protrusion)
Weight
: approx. 170 g (2 Batteries included), approx. 120 g (Battery excluded)
Battery
: AA alkaline battery (x 2)
Continuous operating time: more than 1800 hours (under normal temperature, no alarms, new battery)
Reference standards: IEC61526 Ed3.0(2010), ANSI N42.20(2003)
USB interface
: USB2.0, micro-B（Use with power supply and communication
*NRF51 does not have a function to charge batteries.
Recommended USB cable・・・CW-117MC（Core wave）or equivalent
* It may not work when use except for recommended USB cable
RoHS compliant
8.
0 uSv to 10 Sv, 0.0 mSv/h to 10 Sv/h for neutron
100 uSv/h to 10 Sv/h (dose rate)
50 mSv/h to 10 Sv/h (dose rate)
: Within ±20 %（Cs-137, 50 keV ～ 6 MeV）
Within ±50 %（Cf-252, 250 keV ～ 4.5 MeV）
: Within ±20 %（Cs-137, Vert. and horz. to ±75°）
Within ±30 %（Cf-252, Vert. and horz. to ±75°）
Specification
TN5A4215b
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