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Discuss why short lived radioactive isotopes pose a serious danger to humans who are directly exposed to them, but are not considered a problem for long term disposal, while very long lived radioactive isotopes are much less harmful to those directly exposed to them, but are considered a serious problem for long term disposal.
(NOTE:Be sure to discuss both aspects: why one is more harmful in the short term than the other and why one is more problematic in the long term than the other.)
(NOTE:Be sure to discuss both aspects: why one is more harmful in the short term than the other and why one is more problematic in the long term than the other.)