Cadmium free lead alloy for reusable radiotherapy shielding.
A low melting point cadmium free fusible lead alloy suitable for custom radiotherapy shielding blocks is described. The alloy, referred to here as Alloy-203, differs in composition from the more common Lipowitz's metal (Cerrobend) by being cadmium free, having a slightly higher lead content and a 203 degrees F melting temperature. Attenuation properties have been studied for 4-18 MV X-rays. Alloy-203 has lower transmission than Lipowitz's metal, primarily due to the higher content of lead and bismuth. Daily use for the past 2 years at Mayo Clinic has not indicated any major problems associated with the use of this cadmium free alloy for custom shield fabrication.
Blackwell
C R
CR
Division of Radiation Oncology, Mayo Clinic, Rochester, MN 55905.
Amundson
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KD
D000497:Alloys; D002104:Cadmium; D006801:Humans; D007854:Lead; D011835:Radiation Protection / Q000295:instrumentation*
D000497:Alloys; D002104:Cadmium; D007854:Lead