Neutron activation measurements for Eu, Sc, Cs. Th, Ta, and Fe on 6 samples of pottery and rock by the Hebrew University and the Lawrence Berkeley Laboratory have been compared. The average disagreement exclusive of counting errors was 1.1%. The practical importance of this study to archaeology is that data taken on source materials in one laboratory can be used by the other. Methods of determining the consistency of measurements within a laboratory and sources oferrors are also discussed.
The atomic-beam technique has been used to study the Stark effect in the 4p level of potassium. The results, expressed in terms of three polarizabilities, are found to be in good agreement with the Bates and Daamgard calculation of oscillator strengths.The study of the Stark effect of atomic levels is important in that the Stark shifts are directly determined by the oscillator strengths connecting the level under study to near-lying levels of opposite parity. Hence the measurement of these shifts serves as a direct test of theoretical calculations of oscillator strengths. Perhaps the simplest of the available theoretical methods for predicting oscillator strengths is the Coulomb approximation of Bates and Daamgard, 1 which is easily made to yield numerical values. Recently we have begun a program for checking the applicability of the Bates and Daamgard oscillator strengths to the Stark effect of the first excited p level of the alkalis by studying the Stark effect in the D lines of cesium and rubidium. 2 In this paper we report the extension of these measurements to the 4p level of potassium.The basic method employed is the atomic-beam method for studying the Stark effect that was used in cesium and rubidium. 2 ? 3 However, because of the small hyperfine structure (hf s) of the potassium ground state, it is necessary to employ an absorption cell to obtain narrow absorption lines in the broad lamp emission line. 4 This modification can be understood with reference to Fig.
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