Broadie, William David

2018-03-29T12:19:44Z

2018-03-29T12:19:44Z

1952

As the results obtained from the study of ²³³Pa have been discussed at some length in earlier sections of this chapter, this section will consist simply of a recapitulation of the main conclusions.

1. γ-rays and internal conversion electrons. In the region above 19 keV, 12 γ-rays have been identified from a study of their internal conversion electrons. The energies of the γ-rays agree well with those given by Keller and Cork (1950) who, however, list one additional weak γ -ray of 377 keV. The relative intensities of the internal conversion electrons have been measured and the results agree well with the values given by Elliott and Underhill (1952).

2. The spectrum at low energies. Interpretation of the L-Auger spectrum is complicated by the presence of internal conversion electrons, but the transitions suggested to explain those lines definitely identified as Auger lines are in agreement with transitions occurring in the spectra of RaE or RdTh or both. L conversion electrons of the 28.7 keV X-ray have been identified in the 7 keV region, and some evidence has been obtained for a 17.2 keV γ-ray.

3. The continuous ß-spectra. The main part of the (3-spectrum of ²³³Pa ends at 256 keV but there is a low intensity partial spectrum extending to 568 keV. These results agree very well with those of Elliott and Underhill. The main part of the continuum has been shown to consist of three partial ß-spectra, the intensities of which have been roughly estimated.

4. Disintegration Scheme. The energies and intensities of the ß-spectra and of the γ-rays and internal conversion electrons fit satisfactorily into the decay scheme given in Figure 5.14.

5. The number of electrons emitted per disintegration of ²³³Pa. The number of electrons emitted per disintegration of ²³³Pa, excluding M and N -Auger electrons, was found to be 2.0 ± 0.15. This is lower than the figures published by ICarraker (1951) and by Seaborg (1942), but it is suggested that their values may include the M-Auger electrons and possibly an appreciable fraction of the M x -rays.

http://hdl.handle.net/1842/29331

The University of Edinburgh

Annexe Thesis Digitisation Project 2018 Block 17

Studies in low energy magnetic spectroscopy using sources of RaD, MsTh2 and ²³³Pa

Thesis or Dissertation

Doctoral

PhD Doctor of Philosophy