The dilfusion cofficient of unattached and attached radon daughter products

الملخص EN

The diffusion coeffrcient of unattached and attached radon decay products is a very important parameter in the calculation of radiation dose to the lung.

Its effect on the dose estimation may vary by up to a factor of two depending on the value chosen.

In the present work, the values of the diffusion coefficient were investigated for several published measurements, and was found that there was a wide range of its values measured in different laboratories.

The main reasons of its variation were discussed.

It was concluded that the growth of particle size, when the radon decay products attach themselves to other molecules, or aerosols, in the air, was the main