S.E. International Sentry EC Dosimeter & Ratemeter

Radiation Dosimetry

Part # NMSENTRY Category Tag

The Radiation Alert® Sentry EC is a Personal Alarming Radiation Dosimeter & Rate Meter. This model is designed to ensure the safety of personnel that work in occupations with potential x-ray or gamma exposure.

The pocket sized unit has an energy compensated tube for a linear response to gamma and built in memory for recording data points for tracking accumulated exposure. The free SentryCom Software enables you to generate incident reconstruction for analysis. The software also permits you to easily set the vibrating and audio alert to your desired levels for dose (>1.0 mR/10 µSv) and dose rate (>1.0 mR/hr/10 µSv/hr).

Use the audio switch to choose between audible clicks with each count received or a discreet silent mode.



radiation_icon_bllack gamma_icon_black x-ray_icon_black

Energy Compensated GM Tube

Operating Range

Dose Rate: 0.1 – 15 R/hr (1 µSv/hr – .15 Sv/hr)
Accumulated Dose: 0.1 – 65 R (1 µSv – .65 Sv)

Dose Rate Linearity

Better than ±15% up to 15 R

Energy Response

Down to 20 KeVSentry USB Energy Response Curve

Gamma Sensitivity

1.5 cps/mR/hr (Co60)


Typically ±15% of reading (Cs137)



Audible Alarms

Accumulated Dose & Dose Rate, 90db @ 1 ft.

Alarm Thresholds

Default: Dose 500 mR / Rate 50 mR/hr
Sievert Option: Dose 5000 μSv / Rate 500 μSv/hr Alarm and warning levels are user selectable with the Free SentryCom Software.

Switch Functions

Power, Vibrate & Audible Alert, Silent Vibrating Only Alert, and Audio Clicks On/Off.

Power Requirements

9-Volt Alkaline Battery(Included) Approx. 1500 hrs at normal background.

Temperature Range

-10° to +50°C (14° to 122°F)


10% to 70% Non-Condensing.


243 g (8.6 oz)


Anodized Aluminum Housing w/ Metal Belt Clip


106 x 67 x 28 mm (4.2 X 2.7 X 1.1 in)


NIST Calibration, 9 volt battery, Free SentryCom software download, USB Cable

Limited Warranty

1 year limited

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