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25 microcuries 7-ray method a-ray electroscope active miners amount of emanation amount of radium Artificial ventilation atomic number atomic weight barium Barker and Flinn bo bo breathing change of air chlorides COMMITTEE ON RADIOLOGY concentration of radium COUNCIL of CANADA cubic foot disintegration dust and emanation dust concentration emission emitted per second examination exist in equilibrium expired air exposure extraction of radium Flinn 12 fractionation by crystallization hydrochloric acid investigation Joachimsthal Katanga leak LEITCH lung Mache units measurement of radium microgram of radium millimicrocuries per litre million particles mining Montreal National Research Council number of atoms Ottawa particles per cubic pitchblende process of fractionation radiation radioactive radium and mesothorium radium bromide radium content radium emanation RADIUM INDUSTRY radium poisoning radium sulphate radium workers radon retired miners salts Schlundt soda ash Sodium uranate stoneware Toronto type of mask uranium X2 vein material water containing emanation weight of 234