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Alexander Hohn, Heinz H. Coenen, Syed M. Qaim

Positron emission intensity in the decay of ^120gI

The β⁺/EC ratio in the decay of ^120gI (T_1/2 = 1.35 h), i.e. the β⁺ emission intensity, was measured for the first time using a high purity ^120gI source, which was produced by irradiation of 99.0% enriched ¹²⁰Te with 15 MeV protons, followed by a chemical separation of radioiodine. Both γ-ray and X-ray spectroscopy were applied. In the former case a comparison of the intensity of the annihilation radiation with that of the 1523 keV γ-ray of ^120gI was done and in the latter case with that of the Κ_α or Κ_β X-ray of the daughter tellurium. Corrections for very small contributions of ¹²¹I and ^120mI impurities were evaluated. The literature values for the I_β+ of ^120gI range between 39 and 81%. Our measurements lead to a value of 56±3%.

Radiochimica Acta, Oldenbourg Wissenschaftsverlag

Print ISSN: 0033-8230
Volume: 88, 03/2000
Pages: 139

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