Hostname: page-component-cd9895bd7-fscjk Total loading time: 0 Render date: 2024-12-24T12:55:54.642Z Has data issue: false hasContentIssue false
  • English
  • Français

The total energy of the γ-radiation emitted from the active deposit of actinium

Published online by Cambridge University Press:  24 October 2008

E. Kara-Michailova
E. Kara-Michailova
Affiliation:
Yarrow Research Fellow, Girton College
Get access Rights & Permissions [Opens in a new window]

Extract

The disintegrations by which Ac B passes into the inactive AcPb are accompanied by a γ-radiation very weak compared with the intense γ-emission in the case of Ra or Th-active deposit. The analysis of the secondary β-ray spectrum of actinium-active deposit has revealed the existence of at least five γ-rays (1) (see Table I), of which the ray with energy 0·349 × 106 e.V. definitely belongs to the disintegration Ac C—C″ and is associated with the fine-structure of α-particles of Ac C. According to the measurements of Surugue the two rays of 0·4038 × 106 and 0·4257 × 106 e.V. energy are to be attributed to the disintegration AcB—C, whereas the origin of the 0·829 × 106 e.V. ray is less definite. The fit with experiments is best if this ray is assumed to be emitted from Ac B—C; but it may also (within experimental error) be attributed to the disintegration Ac C″—Pb. Experiments on the absorption coefficient of the γ-radiation of RaAc and its disintegration products prove that the 0·829 × 106 e.V. ray is the hardest γ-ray emitted by the active deposit of actinium(2). The value for the absorption coefficient between 4·6 and 10·6 cm. of lead was found to be μ/ρ = 0·76, in good agreement with the value found in previous experiments at smaller absorptions in aluminium (3). There is, on the whole, excellent agreement concerning the energies of the γ-components as measured according to different methods by different observers.

Type
Research Article
Information
Mathematical Proceedings of the Cambridge Philosophical Society , Volume 34 , Issue 3 , July 1938 , pp. 429 - 434
Copyright
Copyright © Cambridge Philosophical Society 1938

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

(1)Subugue, J.Journ. de Phys. (7) 7 (1936), 337.Google Scholar
(2)Curie, M. and Savel, P.Journ. de Phys. (7) 4 (1933), 457.Google Scholar
(3)Rutherford, E. and Richardson, H.Phil. Mag. 26 (1913), 937.CrossRefGoogle Scholar
(4)Li, K. T.Proc. Roy. Soc. A, 158 (1937), 571.Google Scholar
(5)Hulme, H. R., Mott, N. F., Oppenheimer, F. and Taylor, H. M.Proc. Roy. Soc. A, 155 (1936), 315.Google Scholar
(6)Ellis, C. D. and Aston, G. H.Proc. Roy. Soc. A, 129 (1930), 180.Google Scholar
Skobeltzyn, D.Zeitschr. f. Phys. 58 (1929), 595.Google Scholar
Alichanow, A. I. and Spiwak, P. E.Phys. Zeitschr. d. Sowjet-Union, 11 (1937), 351 and 354.Google Scholar
(7)Tarrant, G. T. P.Proc. Cambridge Phil. Soc. 28 (1932), 475.Google Scholar
(8)Sargent, B. W.Proc. Cambridge Phil. Soc. 25 (1929), 514.Google Scholar
(9)Zlotowski, I.Journ. de Phys. (7), 6 (1935), 242.Google Scholar
(10)Gray, L. H.Proc. Roy. Soc. A, 159 (1937), 263.Google Scholar
(11)Jaffé, G.Ann. der Phys. 42 (1913), 303.CrossRefGoogle Scholar
Lea, D. E.Proc. Cambridge Phil. Soc. 30 (1934), 80.Google Scholar
Bowen, J. S. and Cox, E. F.Phys. Rev. 51 (1937), 232.Google Scholar
Clay, J.Proc. Amsterdam Akad. 40 (1937), 824.Google Scholar