Radioactive Needles Containing Cobalt 60

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Abstract
Radioactive needles were made from an alloy wire composed of 45% Co and 55% Ni. A needle 3 cm. long, 1 mm. in diam., and weighing 0.193 g. showed 2.97 milliroentgens / hr. at 1 m. and gamma radiation equivalent to that from 4.08 mg. of radium when the gold leaf electroscope was surrounded by 1 cm. of lead. The soft beta radiation should be removed by filtration when only gamma radiation is desired. This is done by encasement in thin casings of stainless steel or Monel metal. The alloy is strongly magnetic and can be handled with an electromagnet. The half-value thickness of the gamma radiation in lead is 0.41 inches. The alloy can be machined to any shape before it is made radioactive. The wire can be bent to fit lesions such as tumors in bone.

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