Abstract
A radioactive tracer gas technique has been developed to provide a convenient way of investigating the movement of the type of respirable dust cloud produced when explosives are fired in ventilated mine workings. The cloud is simulated by the radioactive tracer gas methyl bromide, containing γ- and β-active Br 82. A cloud of the gas suddenly released in a full-scale mine-type tunnel is carried by the ventilating air past a number of Geiger counters. These are connected to a recording apparatus so that the variation of active gas concentration with time at several distances from the point of release of the cloud is obtained. The records are used to calculate the dispersion of the cloud. The technique has been applied to a number of simulated mining situations in order to assess the dust hazard from shot firing. A few of the results are briefly referred to in the present paper.
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