Practical Mathematics for Grade 12, Problem ID: 5238
Leslie Green asks
"Suppose a particular nuclear waste material has a half-life of 100 years.
What could you do to reduce the radioactivity of the material itself to less than 7% of its current value?
(The half-life of a radioactive material is the time it takes, on average, for half of it to change into something else by spontaneous radioactive decay.)"
Form it into vitrified glass, then lead, then concrete, and bury it under a mountain.Wait for 400 years.Encase it in lead, then concrete, then steel, then bury it in a deep ocean trench.Heat it to at least 4000°C for at least 5 days.