Ahmed;

Search and find studies that measure the effective dose and annual effective dose for radon concentration with respect to the soil and water samples. ı am sure you will find enough studies.

I think it's better to follow this link because it contains valuable informations and more than 100 references covering several aspects

http://en.wikipedia.org/wiki/Radon

I think we must calculete emanation rate from the soil or water it the major factor to know the concentration of acumulated radon then effective dose and annual effective dose calculeted because they related to the amounnt absorbed by target? and so on....

A. For water: Internal consumption leads to higher stomach dose. External irradiation has several by effects. My team has published on bot issues:

Internal

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Rad. Prot. Dosim. 2003 106(3): 219-226

Rad Prot.Dosim. 2004 112(2): 251-258

Radiat. Meas. 2008 43(7): 1305-1314. (better approach)

External

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J.Environ. Radioactiv. 2004 76(3):283-294

Sci. Tot. Environ. 2007 373: 82-93

Sci. Tot. Environ. 2008 405 (1-3): 36-44.

Sci. Tot. Environ. 2010 408: 495-504 (better approach)

Environ. Sci.: Processes Impacts, 2013,15, 1216-1227

From Soil:

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To my knowledge there has not been a concern on that. Indeed the contribution from soil radon is (a) radon diluted in atmosphere (2) radon diluted in water. For the first we employ several approaches that depend on (I) F-factor (II) EEPC (III) OF (IV) aerosol size distribution and so on.

A recent review of me and my colleague on the subject is

Frontiers in Public Health 10/2014; 2:207.

Therefore: I would suggest (i) measure radon in water content (ii) measure radon and progeny concentrations outdoors and indoors (iii) calculate dose to stomach region & effective dose due to water consumption (iv) calculated dose due to radon inhalation.

Thank you very much Dr. Dimitrios for your useful answer and links.

i am agreed with dr. Nikolopoulos