DURRIDGE NATURAL ROCK SAMPLE Manuel de l'utilisateur - Page 4
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2 RAD7 RADON SENSITIVITY CHECK
After sitting sealed on a shelf for one month, the radon in the Natural Rock Sample container will have
reached within 1% of a steady value, in which the rate of emission of radon into the container is equal
to the rate of loss by decay and leakage. If that quantity of radon is known, and if it is distributed
around an air loop of known volume, then the radon concentration in the air is known. If one of the
devices in the air loop is a RAD7, the RAD7's reported radon concentration may be compared with the
known concentration, and thus the sensitivity of the RAD7 may be effectively checked. A correction
may be applied to the Natural Rock Sample radon reading to account for the ambient air radon
concentration (see Section 2.4).
Figure 2 Radon Sensitivity Check Setup
In practice, provided the device and tubing configuration is identical to the calibration setup, all that is
required to check the RAD7 sensitivity is to compare the 'standardized' average RAD7 reading (see
below) with the standardized average reading on the Natural Rock Sample calibration certificate. The
ratio of the two will give a correction factor that may be applied directly to RAD7 readings.
Sec$on 2
RAD7 Radon Sensitivity Check
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