DURRIDGE NATURAL ROCK SAMPLE 사용자 설명서 - 페이지 4

{카테고리_이름} DURRIDGE NATURAL ROCK SAMPLE에 대한 사용자 설명서을 온라인으로 검색하거나 PDF를 다운로드하세요. DURRIDGE NATURAL ROCK SAMPLE 14 페이지. Performance monitoring accessory for the rad7

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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