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For the investigation of flooding processes in uranium mines, Ra and Th nuclides as well as 238 U and 227 Ac activities in waters were simultaneous analyzed by γ-ray spectrometry. The activities of 227 Ac and 228 Th, not directly determinable by γ-ray spectrometry, can be calculated from two consecutive measurements (≈25 d delay) of the progeny 227 Th and 224 Ra. For the short-lived radionuclides 234 Th, 227 Th, 223 Ra and 224 Ra a correction of the results to the sampling date is necessary.

Es wurden einige k0-Faktoren fur die Standandisierung der Multielement-Neutronenaktivierungsanalyse bestimmt und mit Werten verglichen, die aus Kerndaten berechnet bzw. von anderen Antoren bestimmt wurden.

Die Komparatormethode hat sich in der Reaktoraktivierungsanalyse [1, 2] zur Standardisierung sowie zur kritisehen Einschatzung der Literaturwerte fur thermische Wirkungsquerschnitte, Resonanzintegrale und absolute γ-Intensitaten [3 -5] bewabrt.

In the meteorites trace elements have been determined by instrumental and radiochemical N.A.A. and the cosmogenic radioactivity of 22Na, 26Al, 48V, and 54Mn are measured by low-level gamma spectrometry in the two meteorites Hohenlangenbeck and Trebbin fallen November 1985 and March 1988 onto the territory of the GDR. The contents of Rb and Cs in the meteorite Hohenlangenbeck are relatively high indicating a low condensation temperature. Becuase of the small activity ratio of 22Na/26Al a lower particle flux in its orbit during the last five years is assumed.

Abstract: For89Sr and90Sr determination in grass samples neutron activation analysis was employed as an advantageous method for yield measurements during the separation process. From the activity ratio found conclusions on the source of radioactivity are possible taking into consideration the dependence on reactor operating time.