COUNTERMEASURES AGAINST EXCESSIVELY ENHANCED LEVELS OF RADON IN HOMES IN MINING AREAS

摘要

As mentioned above, the target for new buildings is an annual radon concentration of 250 Bq/m~3, the upper limit of the normal range. In the well known mining districts, radon protected construction of new houses should generally be done independent of future decisions about artificial or natural mine ventilation. Therefore, for decisions on the installation and operation of underground ventilation systems, this problem is of secondary importance. With respect to the remediation of existing houses in such areas, the 'pros' and 'cons' of the use of this general method or of individual methods (remediation of single buildings) must be considered. The advantages and disadvantages of underground ventilation are as follows: Pros:1. possible involvement of many houses; 2. directed release of the underground radon; 3. avoidance of uncontrolled radon exhalation from mainly unknown cracks or gaps; 4. no necessity for alternative areas for the construction of new houses; Cons:1. permanence of maintenance and operation costs, particularly with artificial ventilation;