IDENTIFICATION OF NON-URANIUM MINES WHICH PRESENT A RADON RISK THROUGH MEASUREMENTS OF THE EXHAUST AIR
During preliminary campaigns in 8 non-uranium mines in the European Community (EC), the level of radon risk to which workers in these mines could be exposed was measured. It was determined that a certain number of workers in several of these mines could be exposed in a year to effective dose equivalents ranging between one tenth (5 mSv) and three (15 mSv) times the recommended dose equivalent limit. It was, therefore, requested that an exhaustive study of the level of radon risks in EC mines be conducted. The first step was to find a method which makes it possible to determine through the use of simple and cheap measurements the mines in which a dosimetric campaign should be carried out. The method used is based on modelling the formation of radon daughters in the tunnels. The results of the model show that the mines where the exposure levels could lead to individual dose equivalents higher than one tenth of the individual limit should be able to be detected by measurements carried out in the exhaust air, without having to go underground in the mine. Four parameters have been measured: 222-Rn concentration, apparent age of radon in the exhaust air, mean parietal radon flow and the ratio of the concentration of 222-Rn to the total number of atoms of 222-Rn, 212-Pb, 212-Bi in the exhaust air.
Bibliographic Reference: INTERNATIONAL CONFERENCE ON OCCUPATIONAL RADIATION SAFETY IN MINING, TORONTO (CANADA), OCT. 14-18, 1984 WRITE TO CEC LUXEMBOURG, DG XIII/A2, POB 1907 MENTIONING PAPER E 31715 ORA
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Record Number: 1989123029700 / Last updated on: 1987-01-01
Available languages: en