Neutron Irradiation on SS316 Material for Radioactive Endovascular Stent Production

摘要

It was reported that restenosis could be prevented by radioactive endovascular stent. SS316 material of endovascular stent has been irradiated at pneumatic rabbit system of G.A. Siwabessy reactor for 5 minutes for producing radioactive stent by neutron activation. After 10 days of decay, the irradiated SS316 was measured by gamma spectrometer. The radioisotopes of Cr-51, Fe-59 and( 60)Co were detected in the irradiated SS316 with radioactivity of 5990, 107 and 109 Bq/mg respectively. The Calculation results showed that radioisotopes of Cr-51, Fe-59 and( 55)Fe were produced by neutron activation. The radioactivity of Cr-51, Fe-59 and Fe-55 were 6051, 70 and 110 Bq/mg respectively. In the irradiated materials, the Fe-55 was not detected because the radioisotope emitted radiation with very low energy (5.9 keV). It is considered that radioisotope of Co-60 was produced from cobalt impurity in the SS316.