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F, Ojtke Memowzdzm QUNITED STATES GOVERNMENT i:” b Walter D. Claus, Chief of Applied Bio Physics DATE: J* 24, 1951-- Branch, Division of Biology & Medicinej USAEC5 Washin . SUBJECT: REPORT ON AIRBORNE ACTIVITY AT IDO AS RESULT OF K)PERATIONGreenhouse’ As per your request this memorandum is a summary of our air /< monitoring operations in the Idaho Operations area. Due to the high temperature inversion problem encountered here and the complete lack of w evious background“readingsy we were somewhat at a loss to be able to get a very definitive type of indication except in the case of the heavier concentrations of ,. activity. Due to this above difficulty we “arecertain that we .~~ have failed to evaluate all of the activity ~ich we undoubtedly We have worked closely with the Weathe& Bureau on the inversion : ~~‘, problem so that we have a% indication as to its time and inbensity. You will note a plot of the inversion data on the upper section of ,’ the Central Facilities graphs. This was the only station at which ,, the inversion data was available. This inversion data has correlated quite well,with our peaks of activity but a separation of the effects due to the inversion and abnormal radioactivity is impossible with our limited data. All we have is an indication as to intensity and its time interval. ‘, With the above difficulties in mind we felt that the’only method ~,~ for conclusively reading twice background was to note the ebb period (no inversion present). When the activity was found during these periods to be near or above twice background, a report was sent to you as requested except in a few cases mentioned below. Normal background was assumed for all stations to be about 60 x lC? counts per hour or about 100 counts per minute. ,This had to be assumed on the basis of what could be determined on days of normal activity.
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ATOMIC ENERGY COMMISSION IDAHO FU. IDAHO t contains information aff ‘ may result in seve es under applicable Federal laws.
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