Wolfram|Alpha

Computing...

Input interpretation:

I-131 | effective lifetime


Result:

11 days


Decay properties:

half-life | 8.0252 days  (8.023 to 8.027 days)\nmean lifetime | 11.578 days  (11.574 to 11.582 days)\ndecay constant | 9.9967×10^-7 per second\nspecific activity | 4598.8 TBq\/g  (terabecquerels per gram)\ndecay modes | beta^- (electron emission)

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