MEASUREMENT OF THE /cap beta/ AND $gamma$ ACTIVITY FROM FALL-OUT

Measuring methods and measured results of the BETA activity from fall- out at Giessen and Laubach, Germany, are given. It was established that the BETA activity per cm/sup 3/ fall-out was over the maximum permissible amount for constant administration. The average monthly value in July 1957, was twice as large as in October 1956. The average value of the daily BETA activity per m/ sup 2/ of collecting surface increased in the same time pericd by a factor of three. In order to detect a single component of the fission product mixture, the gamma energy spectrum of rain water residue wns obtained with a single-channel scintillation spectrometer and later with a commercial four-channel spectrometer. The measurements were made in the energy range from 20 kev to 1 Mev. The spectra of residues with an activity of at least 10/sup -3/ mu c could be obtained with statistical accuracy. The isotopes Ce/sup 141/, Ce/sup 144/, I/sup 131/, Zr/sup 95/, and Nb/sup 95/ were detected. An exact determination of Ba/sup 140/ and Nd/ sup 147/ was not possible. The dependence of the spectra on the age of the residues confirmed the results. (tr-auth)