DURRIDGE RAD7 Gebruikershandleiding - Pagina 10

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3.2 Data Conversion Formulas

The RAD7 gives an accurate reading of the radon

concentration in the closed air loop. With the Water

Probe, this air reaches equilibrium with the

surrounding water. To convert the air concentration

to water concentration, the air concentration must be

multiplied by the partition coeﬃcient, which is given

by the Fritz Weigel equation (Weigel, 1978):

a = 0.105 + 0.405 * exp(-0.0502*T)

where T is the temperature in degrees Celsius.

At 10 degrees Celsius, a is around 0.35, giving, at

equilibrium, a three-to-one ratio of radon in air to

water. The Fritz Weigel formula is applied

automatically in CAPTURE when the Water Type is

set to Fresh Water in the Run Parameters Window, as

shown in Fig. 3, below.

Section 3

Data

Fig. 3 The CAPTURE Run Parameters Window

If the Water Type is set to Saline Water in

CAPTURE's Run Parameters Window, the radon in

water concentration is calculated using the Schubert

et al. formula, which is a function of both water

temperature and salinity. (See Schubert et. al., 2012.)

The Run Parameters Window provides a ﬁeld for

specifying the salinity of the water, in parts per

thousand. Note that this formula is suitable for water

samples with any degree of salinity, including zero.

When the salinity value is set to zero, it produces

results that are nearly identical to those produced by

the Fritz Weigel formula.