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Bjørn Magne Sundal

Koki Yoshioka

Erlend Bolle

A radon gas sensor comprising: a diffusion chamber; a photodiode positioned inside the diffusion chamber; and a photomultiplier positioned inside the diffusion chamber; wherein a scintillating material is provided on at least a part of an inner surface of the diffusion chamber. The photomultiplier detects more alpha particles, but cannot distinguish the energies of different alpha particles. On the other hand, the photodiode can distinguish different decays because the magnitude of the signal generated by the photodiode is proportional to the kinetic energy of the alpha particle striking it. Thus, the photodiode produces spectral data. The spectral data is used to estimate the amount of Polonium that is adhering to aerosols. This is used to apply a correction factor to the data to provide a better estimate of the true Radon concentration in the chamber. This can be combined with the count data of the photomultiplier for overall improved data.

Radon gas sensor

A method of measuring a radon concentration or a radon exposure level comprising: placing a plurality of individual radon measurement instruments at locations, each instrument being capable of data output; receiving radon measurement data from each of said plurality of instruments; combining said data from said plurality of instruments into a single data set; and calculating a radon concentration or radon exposure value from said single data set. Using a plurality of individual detectors and combining their data provides a much better overall analysis of radon concentration or radon exposure level. The calculated value may include producing an average of the radon concentrations across the multiple instruments. The average may be weighted with weights determined according to different locations such as proximity to ventilation devices or based on the time that an average user spends in each location.

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Oslo, Norway

Bjørn Magne Sundal