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| 1. |
The rate of radioactive decomposition corresponding to 3.7 xx 10^(10) disintegration per second is called a curie. What weight of ""^(225)Ra, whose t_((1)/(2))=1620 yr, will be required to yield 1 millicurie of radiation? |
| Answer» SOLUTION :`1 xx 10^(-3)G` | |