489 



Variation of the Emanation Content of Certain 



Springs. 



R. R. Ramsey. 



While measuring the radioactivity of springs in the neighborhood 

 of Blooniington, Indiana. I found that the measurements made at certain 

 times did not agree with those made at other times. The discrepancy 

 was so great I set out to see if the difference was due to errors or was 

 a real difference. I selected two springs and have tested them once a week 

 for about three months. One, the Hottle Spring, is due north of the 

 square near the corporation line. The other is due west of the square a 

 little beyond the corporation line, across the Illinois Central Railroad from 

 the railroad pumping station. These springs are 1.3 miles apart. Each 

 has a flow of abut 15,000 gallons per day. The flow of the Illinois 

 Central Spring has perceptibly lowered during October and November. 

 The Illinois Central Spring issues from the ground at the root of a beech 

 tree through coarse gravel or stones. The Hottle Spring issues from a 

 crack in solid rock. 



The results are shown in the following table : 



Variation of Emanation* Content of Certain Springs near Bloomington, Ind. Expressed in 



Curies per Liter. 



Date. 



Temp. C 



J. C. S. 



Hottle. 



111. Cent. 



Mar. 4 

 Mar 13 



12.0° 

 10.3° 

 11.5° 

 12.2° 



X 10-'= 

 430. 

 170. 



X 10-" 



600. X 10"" 



May 16 







May 23 





265. 



July 24 







330. 



Aug. 5 



12.5° 



13 and 13° 



15° 



13 and 12.8° 



13 3 and 13° 



13 and 12.7° 



13 and 12.6° 



13 and 12.6° 



13 nd 13° 



13 and 13° 



13 and 13° 



13 and 13° 



13 and 13° 



425. 







Sept. 24 



650. 



445 



Oct. 9 



530. 





Oct. 16 



695. 

 700. 

 665. 

 650. 

 705. 

 520. 

 550. 

 535. 

 510. 

 450. 



166 



Oct. 23 





1 9 



Oct. 30 





20 







40 



Nov. 13 





20 



Nov. 20 





20 



Nov. 26 





33 



Dec. 3 





60 



Dec. 11 





20 



Dec. 18 





00. 









