[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is a radioisotope of the metal palladium used in brachytherapy implants or 'seed'. With a half-life of 17 days, palladium 103 administered with brachytherapy allows continuous, tumor-site specific low-energy irradiation to the tumor cell population while sparing normal adjacent tissues from radiotoxicity. (NCI04)"}, {"from": "gpt", "value": "[103Pd]"}]