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For workers' monitoring in uranium underground mines, an individual dosimeter measuring the three monthly dose equivalents (gamma, potential alpha energy, long-lived alpha emitters) is compulsory. The aim of the ambient monitoring is the early prevention of every defects in the primary and auxilliary ventilation, which is the basis of prevention.

Article published by EDP Sciences and available at http://www.edpsciences.org/radiopro P. ZEïTWOOG ef a / . signature of uranium, radium and radon can clearly be recognized from the same product of natural origin. For exemple in tbe case of radon the industry produces only 222Rn whiie the naturai emanations are composed of 2% and zzzRn. In the case of radium the industry produces only 226Ra whiie both 226Ra and 2"Ra are present in the natural environment. Demonstration of completion with regulatory l i t s in situations where the industrial impact is less tban the impact from the natural radioactive environment could be made feasible on a routine basis.