|Source||United States Department of Energy Office of Scientific and Technical Information|
|Subject Keyword||HEALTH AND SAFETY INCLUDING DOSIMETRY ♦ FISSION PRODUCTS ♦ GEOPHYSICS ♦ LEVELS ♦ NUCLEAR EXPLOSIONS ♦ QUANTITATIVE ANALYSIS ♦ RAIN ♦ SAMPLING ♦ STRATOSPHERE ♦ STRONTIUM 89 ♦ STRONTIUM 90 ♦ ZONES|
|Abstract||S>A presentation is made of some views which Concern the time of residence of radioactivcty debris in the statosphere. Formerly the mean time of residence was assumed to be 10 plus or minus 5 years; evaluations at middle latitudes indicate a shorter period, 2 to 4 years. Determinations were made, along a 2000 mile line extending from Denmark to Greenland, of the ratio of strontium-89 to strontium-90 contained in monthly samples of precipitation. A plot is presented for this ratio and the corresponding month. It is inferred, from the increase in the ratio, that 40 to 10% of the strontium-90 fall-out in the period February -June comes from the weapon tests which stopped around November 1, 1958. (B.O.G.)|
|Learning Resource Type||Article|
|Publisher Department||Finsen Memorial Hospital and Radium Centre, Copenhagen|
|Organization||Finsen Memorial Hospital and Radium Centre, Copenhagen|
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