[satterly] natural GASES OF CANADA 159 



it was impossible to estimate the amount in absolute measure. Boyle 

 and Toryi mention that the gas from the well at Viking was not 

 radioactive. A distinct radioactivity was found in two of our samples. 

 One sample was collected at high pressure in a steel tank and its 

 radioactivity was tested twice, on April 10 and April 20 respec- 

 tively, and the law of decay was found to be that of radium 

 emanation so that the activity could not be ascribed to contamin- 

 ation from the tank. Eve- has measured the activity of some of the 

 natural gas escaping from mineral springs at Caledonia Springs, 

 Ontario; Bo>'le and Mcintosh^ have measured some of the gases 

 escaping from the springs at Banff in the Canadian Rockies. 



Satterly in 1914, and Elworthy in 1916, made many measurements 

 on these springs and tested many other springs in Eastern Ontario 

 and Southern Quebec. They found values of emanation content 

 ranging from 140 to 800 x 10"^^ curie per litre in Ontario and Quebec 

 and from 1910 to 3340 x 10"^^ curie at Banff. The following table 

 gives a few of the results obtained by these and other workers on the 

 radioactivity of atmospheric air, air drawn from the soil, marsh gas 

 bubbling from stagnant water, and gas bubbling from saline springs 

 in Canada. Records of other saline springs are given in the paper 

 bv Satterh- and Elworthv, referred to above. 



'Boyle and Tory, Trans. Roy. Soc, Canada. Dec, 1915. 



^Eve. Trans. Roy. Soc, Canada, 1910. 



^Boyle and Mcintosh. Trans. Roy. Soc, Canada, 1913, 



