The December, 1931 absorption experiments by Irene and Fredrick Joliot-Curie using Po Be, PoB and PoLi sources to study penetrating radiation

Details The December, 1931 absorption experiments by Irene and Fredrick Joliot-Curie using Po Be, PoB and PoLi sources to study penetrating radiation The December, 1931 absorption experiments by Irene and Fredrick Joliot-Curie using Po Be, PoB and PoLi sources to study penetrating radiation

Mar 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aps..mar.r1004s&link_type=abstract

American Physical Society, APS March Meeting, March 21-25, 2005, abstract #R1.004

Astronomy and Astrophysics

Astronomy

Scientific paper

The December, 1931 absorption experiments by Irene and Fredrick Joliot-Curie using Po Be, PoB and PoLi sources to study penetrating radiation S.M. Shafroth, Physics and Astronomy Department, University of North Carolina at Chapel Hill 27599-3255, mailto:shafroth@physics.unc.edushafroth@physics.unc.edu The experimental arrangement including the Hoffman electroscope radiation detector and samples of the raw data are shown.^1 The emitted neutrons were interpreted as very high energy penetrating gammas. The exponential decay of detected radiation with thicknesses of Pb from 1.5- 5 cm are shown. I. Curie concludes, based on current knowledge of absorption coefficients vs gamma energy, that the gamma energy from PoBe was 15-20 MeV. However cloud chamber experiments had shown that the ``penetrating radiation'' could eject protons from paraffin with energies of 4.5 and 2 MeV in the case of Be and B respectively. If the ejection mechanism were the Compton effect, the gamma energies had to be 50 and 35 MeV respectively. Finally they conclude that the discrepancy in gamma energies could be ``due to the uncertainties.'' 1. Comptes Rendus de l'Academie des Sciences, S'eance du 28 Decembre 1931

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