Abstract
The decayed sources of steel-sheathed 192Ir seeds have shown residual 60Co activity. The gamma spectra from such sources show the two distinctive peaks for 60Co, whereas the platinum-sheathed 192Ir sources do not show such peaks. This may be due to the low percentage of cobalt present in the magnetic alloy sheath. Though this would not affect the clinical dosimetry, it may be of concern when handling large numbers of such sources for disposal.
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