Radon Exposimeter AlphaE

Professional Exposimeter for the Personal Radon Exposure

The AlphaE is an ultra small continuous radon monitor for professional use. Due to the light-weight and small dimensions it can perfectly be used to measure the personal radon exposure and to manage personal doses.

Based on a silicon diode diffusion chamber the sensitivity is 3 cph at 100 Bq/m³. Thus, also low radon levels below 100 Bq/m³ can be measured as specified by the latest WHO recommendations (12 % uncertainty at 1 sigma / 24 hrs.). The calculation of dose is possible due to a user-settable equilibrium factor.

The development of the instrument is based on cooperation between Saphymo GmbH and the Helmholtz Zentrum, Munich. Extensive measurements and site-tests performed by the Helmholtz Zentrum prove the validity of calibration and correct operation, even in higher humidity applications like in water works, mines, etc.

Specifications:

Detection Principle

Diffusion chamber with silicon diode

Measurement range

20 Bq/m3 ... 10 MBq/3

Sensitivity

3 cph at 100 Bq/m3

Measuring cycle

Adjustable from 1 min to 12 hrs

Storage capacity

12 900 data sets (ca. 9 … 6 450 days, depending on set measuring cycle)

Diffusion time constant

Typically 1 … 2 hrs (user adjustable smoothing factor)

Battery life (rechargeable)

up to 6 months (rechargeable via USB)

Interface

USB, cable incl. charging unit

Additional sensors

Temperature sensor, tamper detection

Display

6 digit LCD + 5 digit alphanumeric, backlight

Dimensions / Weight / Housing

108 mm x 68 mm x 30 mm / 165 g / aluminium

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