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Beta Ray Spectra


Oppenheimer, Frank (1939) Beta Ray Spectra. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/MXNR-VW86.


In part I the various methods of determining the energy distributions of electrons are described. Reasons are given for the choice of a semi-circular focusing spectrograph. The construction of the magnet, the spectrograph box, the field measuring devices and the coincidence Geiger-Muller counters are given in considerable detail.

In part II the experimental energy distributions of the C, N¹³, Na²², P³² and Ra E nuclear electrons are described. In addition the distribution of the internally converted electrons from the Th Pb 2.62 mev gamma ray and of the secondary electrons from the gamma rays of N¹³ and Na²² are given. The connection between these gamma rays and the complexity of the Beta spectra is discussed. In those cases where an independant estimate of the energy of the radio-active transformation is available there seems to be a discrepancy between this independent estimate and the experimental value for the end point of the continuous beta spectra. Several possible explanations of the discrepancies are discussed.

In the appendix the calculations of the distribution of the interally converted electrons from the Th Pb gamma ray are given.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:Physics; radioactivity ; energy distribution of electrons ; spectrograph ; Geiger-Muller counters; gamma rays
Degree Grantor:California Institute of Technology
Division:Physics, Mathematics and Astronomy
Major Option:Physics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Unknown, Unknown
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1939
Record Number:CaltechETD:etd-06182004-140920
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:2638
Deposited By: Imported from ETD-db
Deposited On:21 Jun 2004
Last Modified:20 Feb 2020 18:09

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PDF (Oppenheimer PhD Thesis 1939) - Final Version
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