13
A NEW METHOD TO CONTROL HEALTH EFFECTS OF RADON INDOOR POLLUTION (STEP II)

S.Lo Nigro * , F.Patania * and M.Roccaforte **
* Physics Department Catania University, Viale Andrea Doria, 6, 95125 Catania-Italy ** Applied Physic Institute of Catania University,
Viale Andrea Doria, 6, 95125 Catania-Italy

ABSTRACT
To evaluate the dose arising from exposure to Rn Decay Products (RDP) a term often used is unattached fraction defined as the ratio of the Equilibrium Equivalent Concentration (EEC) arising from unattached radon decay products (URDP) to the total decay products, that is u=EECu/EECt.
This term is important because the large portion of the dose to the bronchial tissue per unit of inhaled activity is thought to arise due to inhalation and deposition of the URDP.
In fact dosimetric model have indicated [1] that the ratio of the dose due to the URDP ranges from 13 to 30 in function of the modelling details and assumption.
More over the RDP that produce greatest health risks are that ones with their decay process characterising by á particles emission [2] both because á particles have mass very bigger than â and
ã particles and because very big emission velocity too, that is biggest energy contents.
In this way a new series of deepened measures are carried out by Portable Gas Surveyor (Silenia-Prassi
mod 5s) and CAMERADON (RADON CHAMBER) nearly by same procedures of our previous survey.
Aim of this paper is to show the obtained results of measures campain that in general confirm efficacy of our control method [3] especially in the case of high level of RDP indoor concentration.