Originally Posted by
soay
Really?
"Of particular concern in nuclear waste management are two long-lived fission products, Tc-99 (half-life 220,000 years) and I-129 (half-life 17 million years)
If an isotope has very long decay times it also has little activity so, it may be a concern to store it for a long time but it also causes relatively little harm if there is a leak.