The use of radioisotopes in research on snow and runoff

TitleThe use of radioisotopes in research on snow and runoff
Publication TypeConference Proceedings
Year of Conference1950
AuthorsGerdel, R. W., and Mansfield C. W.
Conference Name18th Annual Western Snow Conference
Series TitleProceedings of the 18th Annual Western Snow Conference
Date PublishedApril 1950
PublisherWestern Snow Conference
Conference LocationBoulder City, Nevada
KeywordsRadioisotopes, Snow gage radioactive

Three radioactive snow gages were installed in the experimental area at the Central Sierra Snow Laboratory, during December 1949. A geiger tube was held by a 20-ft. Truss arm attached to a 50-ft. Pole. A lead shielded collimator imbedded in concrete beneath the truss arm held 2 units of radioactive Cobalt 60. Impulses of the geiger tube were amplified and transmitted over a 150-foot Cable to the recorder in the main laboratory. Largest sources of error were in variation of background impulses caused by cosmic rays. Four of 7 -- 5 minute counting periods each day gave accuracy within 2 to 5%. Water films of less than 0.01 inch to 55 inches can be measured by means of beta emissions from Strontium 90, and gamma rays from Cobalt 60.