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107 cm ducting 220Rn daughters 900 East Mining air volumes areas assessment auxiliary ventilation beta beta radiation blasting collective dose competent authority considered Dose rate drill drift dust East Mining Block effective dose equivalent electrostatic precipitators ensure Exposure to radon External exposure external radiation facility gamma radiation high grade IAEA Safety Series ICRP increase inhalation installation intake air JOB ROTATION leakage located Long hole maintenance man.Sv milling of radioactive mineral sands minimize mining and milling mining method open pit open pit mines optimization of radiation optimization procedure P.O. Box personal protective equipment PL P CPM potential practice production programme protective measures radiation exposure radiation protection radiation risk radioactive contamination Radioactive decay radionuclides radon daughter concentrations respirators result return air return airways shielding significant stope surface contamination Table tailings thorium tion uranium mines ventilation system WL.h work-place workers