Radon: emanation with temperature

The 210Pb input from the atmosphere must have been constant over the past 150 years due to the relative constancy in the maritime climate (temperature and soil moisture influences the radon emanation rate) and the resulting constancy in the input source for 210Pb. Therefore, the deviations from a single log-linear relationship of the unsupported 210Pb activity with the dry mass of sediment accumulation must be due to some property of the watershed. The three different relationships shown in... 

Radium is chemically similar to barium it displays a characteristic optical spectrum its salts exhibit phosphorescence in the dark, a continual evolution of heat taking place sufficient in amount to raise the temperature of 100 times its own weight of water 1°C every hour and many remarkable physical and physiological changes have been produced. Radium shows radioactivity a million times greater than an equal weight of uranium and. unlike polonium, suffers no measurable loss of radioactivity over a short period of time (its half life is 1620 years). From solutions of radium salts, there is separable a radioactive gas radium emanation, radon, which is a chemically ineit gas similai to xenon and disintegrates with a half life of 3.82 days, with the simultaneous formation of another radioactive element, Radium A (polonium-218). 

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