EXCESS 222 Rn, dpm • T 1 o 



°i 



40 



80 120 



CO 



v_ 



CD 



E 



Q_ 

 UJ 

 Q 



50 



100 



i I i 



I 

 J 



Stevenson Is 



_ JT-.JyM.htUl 



10 



20 



Jfcmrmmf 



Hydrothermal Inputs ? 



Mary Bay 







10 



20 



TEMPERATURE, °C 



Figure 6. Temperature and radon-222 profiles for two stations in 

 Yellowstone Lake: A Mary Bay basin ( ~34 meters max. 

 depth), and a basin near Stevenson Island ( ~98 

 meters max. depth). Supported radon-222 

 concentrations are < 0.06 dpm/1. 



94 



