To assess the exposure, in addition to the experimental measurements of the average concentration of radon in air, it was necessary to establish the number of people and the time spent by each one at the workplace, in order to decide whether remedial actions and their type (constructive and/or administrative) were necessary. This set of tasks made it necessary to involve different services of the CIEMAT organization according to so-called “radon protocol”.
The exposure assessment was carried out by applying two reference levels: 600 Bq m-3 averaged annual radon concentration established in IS-33, below which no type of control should be applied (only optimization) and that of 300 Bq m-3 established in the European Directive which gives priority to optimization above this level and recommends its application even if it is below it.
The results of the measurements together with the occupancy factors at workplace have made it possible to carry out an evaluation of the exposure to radon, identifying the technical and administrative actions to reduce the exposure in the workplace and guarantee compliance with the legislation on exposure to radon.
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