Of the following,which radionuclide is used for permanent prostate implants?

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Some isotopes,such as radon 222 and gold 198,have very short half-lives and are implanted permanently rather than temporarily.This type of therapy is used frequently in the case of prostate cancer.The prostate can benefit from interstitial implants with permanent gold seeds because other isotopes would require surgical procedures for both insertion and removal of sources.

Of the Following,which Radionuclide Is Used for Permanent Prostate Implants