EPD-N2™ Electronic Personal Gamma/Neutron Dosimeter

RADIOLOGICAL

• Sensitive to x- and γ-radiation (E > 25keV) and neutrons 0,025eV < E < 15MeV
• Direct readout of Hp(10) for neutron & photon dose
• Multiple diode detectors with converters and energy compensation shields
• Generally in accordance with ANSI standards 13.11, 13.27 & 42.20 (photons performance) and most  aspects of IEC 61525 (neutrons & photons)

Display Units Sv & rem (with prefixes μ, m), set via internal software

Dose Display & Storage 0μSv to > 16Sv, auto-ranging

Resolution for Display 1μSv (< 10mSv/ 1rem) ( γ, and neutron under best conditions)

Resolution for Storage 1/64μSv (~1.5μrem) (γ), 1μSv for neutron dose under best conditions

Dose Rate Display 0μSv/h to > 4Sv/h (400rem/h), auto-ranging, variable resolution (γ &   neutron)

ELECTRICAL AND MECHANICAL

Power Supply 1 x AA battery, 1.5V alkaline or 3.6V lithium, interchangeable without any adjustment

Operating life Continuous use: 1.5V alkaline: 47 to 55 days; 3.6V lithium: 4.5 to 5 months; 8h/24 with use of ‘OFF’ standby state: 1.5V alkaline: ~ 3 months; 3.6V lithium: ~ 9 months. Assumptions: average dose rate < 5μSv/h (<0.5mrem/h), IR communications < 5s, 2x/day, audible alarm sounding <2h total during battery life

Energy response (γ ) + 20% 30keV to 1.5MeV + 30% 25keV to 7MeV

With a single calibration, the neutron dose estimated by the EPD- N2 will be within approximately + 30% of the true value for many workplace fields

Internal Detector Self -test under CPU control

Accuracy Hp(10) (γ) 10% Cs-137

Communications IR interface, < 1m range (39”)

Display and enabled functions controlled by button on front face of EPD (button recessed and sealed)

Size 86 x 63 x 20 mm (3 3/10 x 2½ x 8/10 in.), without clip

Weight 110 g (~4oz) incl. battery & clip

Case Material High impact poly-carbonate blend

Clip High impact plastic, easily renewed, strong clamp, with eyelets for lanyard (optional lanyard-only version)

ALARMS
Audible & Visual Alarms Photon dose rate (2 ), photon dose, combined photon and neutron dose, neutron dose rate, over-range, failure, count - down timer, low battery,   ‘return for read’. Alarm tone, pattern, sound level, mutability and red LED configurable   via external software

‘Beep’ for γ-dose with configurable sensitivity

Alarm Sounder sealed, typically 97 dB(A) @ 20cm on ‘loud’ setting

MEMORY

• 10 year data retention without battery
• Short term and Total dose registers for Hp(10) γ & n
• Storage of peak photon & neutron dose rates, with date & time (1s resolution for all stored times)
• 23 most recent alarms or events stored with date & time
• Dose profile storage: ~ 500 dose data points for γ & neutron dose with date & time

ENVIRONMENTAL
Operating Temperature -10 ºC to 40 ºC (15 to 105 ºF)
Storage Temperature -25 ºC to 70 ºC (13 to 125 ºF)
Humidity 20% - 90% RH, non-condensing
Protection Rating IP55 (protection against dust ingress & low pressure jets of water   from all directions)
Vibration IEC 1283 (2 g, 15 min.,10-33 Hz)
Shock 1.5 m drop onto concrete on each surface
EMI/EMC Exceeds MIL STD 461D RS103; » IEC 1283 & IEC 61525