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Fallout monitoring data for the United States and Canada during the spring of 1955 "Teapot" weapons test series are reported. In the continental United States individual station totals, extrapolated to January 1, 1956, range from 3.1 to 850 millicuries per square mile. Fallout in Canada and elsewhere is lower than in the United States. There are indications of continuing fallout in not greatly diminished amount for a short time after the close of the reporting period on May 20.
The distribution of fall-out debris and radiation intensities over wide areas may be rapidly surveyed from the air. The development of instruments and techniques must be based on consideration of the beta and gamma characteristics of the radioisotopic constituents of the fall-out material. Radiation measurements in an aircraft may be related to surface conditions by an altitude correction factor, which has been determined by field measurements. Development and field testing, during the Teapot series, has resulted in a group of instruments useful for study of the radiation characteristics of fall-out debris. An aerial survey detector with automatic altitude compensator and a telemetering unit was also completed and tested.