Phanerothyme Posted March 24, 2011 Share Posted March 24, 2011 No mention on the BBC news about the half life of radio Iodine. Although now they say that radiation levels have fallen in Tokyo water, they're not explaining why - it's because radio iodine isn't radioactive for very long at all. Link to comment Share on other sites More sharing options...
Obelix Posted March 24, 2011 Share Posted March 24, 2011 As I noted above in fact... The iodine level has fallen to about half of what it was yesterday which is too fast to account for natural decay (iodine 131 half life is 8 days) so it's more likely that the contamination was a single event and is not ongoing, and the reduction is due to water simply being flushed through the system. As such it's more likley that it's not a reservior contamination but some treatment plant or pumping station that has absorbed iodine from the atmopshere temporarirly, but that's all really conjecture. Link to comment Share on other sites More sharing options...
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