| Show how rainfall affects radium one of the most elaborate investigations of the relation between the amount of radium emanation in the atmos atmosphere eliere and weather conditions I 1 Is s that recently curried carried out by J R wright and 0 F smith at INI manila arilla the observations extending over a period of about 13 months the tha effect of weather conditions upon the rate at which radium emanation is exhaled from the ground and the relation oc the rate of exhalation to the radl radioactivity bac of soil gas at dif different I 1 lerent depths were also investigated rainfall an and wind movement seem to be the principal meteorological controls the amount of emanation la in tho the air being greatest when these factory fantoni are at a minimum and vico vice versa A decided diurnal varia variation tiou is found to exier the emanation content being considerably sider ably greater by night than by day clay |
