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Radon/thoron daughter products
Determining the equilibrium factor for radon based dose management

Determining the equilibrium factor for radon based dose management

With respect to the new radiation protection law, a continuous monitoring with dose management must be established for workplaces where the radon concentration permanently exceeds the legal reference level. Not the radon gas itself represents the risk for health but its radioactive daughter products which are generated in the breathing air due to the radon decay.

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Radon personal dosimetry

Radon personal dosimetry

The cause of the harmful effect of radon is the accumulation of radon daughters in the human respiratory tract. It is not the radon per se that determines the dose but the generated decay products in the air we breathe.

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Fast measurement of the local EEC/PAEC

Fast measurement of the local EEC/PAEC

During site inspections in mines, it is required to take air samples sequentially at different locations. The result should be present as soon as possible. Due to the radon decay chain, the response time in case of continuous sampling is too large for such measurements.

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High thoron exp. in loam houses, thorium-containing building material

High thoron exp. in loam houses, thorium-containing building material

In opposition to radon no statutory regulations are applied for the exposure to thoron daughter products. It should be noticed that, assuming the same source strength, the biological impact of the thoron daughters exceeds the one of the radon daughters significantly. Various kinds of loam but also other building materials contain, either by their nature or by additives, large amounts of thorium.

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