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60Co activity in 192Ir seeds

K R Das1

  • 1Peter MacCallum Cancer Institute, Melbourne, Australia.

Health Physics
|February 1, 1993
PubMed
Summary
This summary is machine-generated.

Residual cobalt-60 (60Co) activity has been detected in decayed, steel-sheathed iridium-192 (192Ir) seeds. Platinum-sheathed seeds did not exhibit this 60Co presence, which may impact the disposal of large quantities of steel-sheathed sources.

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Area of Science:

  • Nuclear Medicine
  • Materials Science
  • Radiation Oncology

Background:

  • Iridium-192 (192Ir) seeds are utilized in brachytherapy for cancer treatment.
  • Decayed 192Ir sources may retain residual radioactivity from their manufacturing or sheathing materials.

Purpose of the Study:

  • To investigate the presence of residual cobalt-60 (60Co) activity in decayed 192Ir seeds.
  • To compare 60Co activity between steel-sheathed and platinum-sheathed 192Ir sources.

Main Methods:

  • Gamma spectroscopy was employed to analyze the radioactive emissions from 192Ir seeds.
  • Comparison of spectral data between steel-sheathed and platinum-sheathed sources.

Main Results:

  • Steel-sheathed 192Ir seeds exhibited characteristic gamma peaks of 60Co after decay.

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  • Platinum-sheathed 192Ir sources did not show detectable 60Co peaks.
  • The presence of 60Co in steel sheaths is attributed to the magnetic alloy composition.

    • Conclusions:

    • Residual 60Co activity is a factor in decayed steel-sheathed 192Ir seeds.
    • This finding has implications for the safe handling and disposal of large volumes of these radioactive sources.
    • Clinical dosimetry is not affected, but waste management protocols may need consideration.