Radioactive Kr Isotopes

L. L. Woodward, D. A. Mccown, and M. L. Pool
Phys. Rev. 74, 761 – Published 1 October 1948
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Abstract

A radioactive isotope of 1.1-hour half-life has been produced in krypton by alpha-particle bombardment of Se74, enriched electromagnetically from 0.9 percent to 14.1 percent. Assignment of the isotope is made to Kr77. Aluminum absorption measurements indicate a positron end point of 1.7 Mev. In addition to annihilation radiation, gamma-rays and K-capture have been observed. The ratio of K-capture to positron emission from the Se74(α,n) reaction is computed as 2.6. The krypton 1.42-day isotope has been produced by an α,n reaction on electromagnetically enriched Se76. The isotope is located as Kr79 and its half-life confirmed. A positron end point of 1.0 Mev is determined by aluminum absorption measurements. In addition to annihilation radiation, gamma-rays and K-capture have been observed. The ratio of K-capture to positron emission from the Se76(α,n) reaction is computed to be 50. The cross-section ratio for formation of Kr77 compared to Kr79 by alpha-particle bombardment of selenium is computed as 1.4. The 4.6-hour Kr85 isotope has been produced by a Se(α,n) reaction.

  • Received 21 June 1948

DOI:https://doi.org/10.1103/PhysRev.74.761

©1948 American Physical Society

Authors & Affiliations

L. L. Woodward*, D. A. Mccown, and M. L. Pool

  • The Ohio State University, Columbus, Ohio

  • *Lieutenont Colonel, USAF. Research under auspices of Air University, Maxwell Air Force Base, Montgomery, Alabama.
  • Captain, USAF. Research under auspices of Air University, Maxwell Air Force Base, Montgomery, Alabama.

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Issue

Vol. 74, Iss. 7 — October 1948

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