Health and Safety Laboratory Environmental Quarterly Report: June 1, 1977 - September 1, 1977 Page: I-85
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WORLDWIDE DEPOSITION OF 90Sr THROUGH 1976
by H. W. Feely (HASL)
The total deposition of 90Sr on the surface
of the earth during 1976 was about 46 kilocuries.
The worldwide cumulative deposit remained at
about 11.5 megacuries as the amount of previously
deposited 90Sr which decayed radioactively only
slightly exceeded the amount of the new deposit.
The late 1976 Chinese atmospheric nuclear tests
may have contributed about 12 kilocuries to the 90Sr
deposition during 1976.
The Health and Safety Laboratory (HASL), has maintained a world-
wide network of samplers since 1957 to collect fallout to be measured
for 90Sr. Based upon data from this network, an estimate has been
made each year since 1958 of the annual worldwide deposition and of
the cumulative deposit of 90Sr (e.g., reference 1) . In general both
the annual and cumulative values have been reasonably well verified
when comparison with results from other programs has been possible
(e.g., references 2,3). For example, in Table l estimates are given
of the worldwide annual deposition and cumulative deposition of 90Sr
as made by HASL and by the United Kingdom Atomic Energy Authority
(UKAEA) for the years 1970 to 1975. Agreement between the two
laboratories is excellent in some years and poor in others,
I - 85
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Hardy, Edward P., Jr. Health and Safety Laboratory Environmental Quarterly Report: June 1, 1977 - September 1, 1977, report, October 1, 1977; New York City, New York. (digital.library.unt.edu/ark:/67531/metadc100819/m1/95/: accessed July 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.