You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is All among the following radioisotope are used as permanent implant except: and explain in detail?
Caesium-137 is not used as permanent implant for Brachytherapy Permanent implants for brachytherapy Iodine-125 Palladium-103 Gold-198 Caesium-131