DoseGUARD™personal alarm dosimeters are precision instruments for ensuring personal safety. The dose rate or cumulative dose is shown on an LCD display. An audible alarm sounds if a preset dose or doserate is exceeded. The instrument can also be set to give an audible warning of the instantaneous dose rate.

The detector element is a silicon diode. Energy compensation circuits ensure high accuracy (better than 5% at 662 keV, linearity better than 15%). Key parameters are stored in EEPROM and are retained even if the battery is removed. The dosimeter casing is robust and splash proof, and is constructed from smooth high impact plastic for easy decontamination. The instrument has been designed to protect the readings against accidental erasure due to mechanical shock or an RF field. It is battery operated, and requires one standard AAA size alkaline cell.

Radiation detected:

gamma and x-rays

Measurement range:

dose: 1 µSv – 9.99 Sv or 0.1 mrem – 999 remdose rate: 5 µSv/h – 3 Sv/h or 0.5 mrem/h – 300 rem/h

Calibration accuracy:

better than ±5% (Cs-137, 662 keV at 2 mSv/h, Hp(10))

Energy response:

Hp(10), 60 keV – 3 MeV, better than ±25%, (up to 6 MeV, better than ±35%)

Dose rate linearity:

better than ±15%, up to 3Sv/h

Audible alarms:

seven separate alarms – integrated dose, dose rate, dose overflow, dose rate overflow at 3 Sv/h or 300 rem/h, low battery 1 and 2, fault

Alarm tone:

better than 85 dBA at 30 cm

Alarm thresholds^*:

six preset values for both integrated dose and dose rate, manually selectable by push-button

Power supply:

one alkaline cell, AAA-size, life typically 1800 h in background dose rate (dose mode)

Push button functions^*:

front panel push button has the following selectable functions – switch ON/OFF, chirp ON/OFF, change alarm thresholds, activate battery test, reset integrated dose, change display (dose/dose rate)

Temperature range:

-20 to +50 °C in operation, humidity up to 90% RH, non-condensed, -20 to +70 °C for storage

Dimensions:

78 mm x 67 mm x 22 mm

Weight:

80g including battery

Battery type:

1.5 V LR03 (AAA)

Battery life time:

approx. 1800 hours