From the point of view of radiation hazard,the radioisotopes of greatest concern are

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Radioisotopes with intermediate half-lives (years to centuries) are of greatest concern from a radiation hazard perspective. Isotopes with very short half-lives decay quickly and do not accumulate in the environment, while isotopes with very long half-lives decay slowly and emit relatively low levels of radiation. However, intermediate half-life isotopes have enough time to accumulate in the environment and can emit a significant amount of radiation over time, posing the greatest concern for long-term exposure.

From the Point of View of Radiation Hazard,the Radioisotopes of Greatest