let us start
by defining what a half life is?
A half life is the time taken for the mass of
a radioactive sample to decay by half of its original mass/ volume/energy.
In other words half life is the time taken for
the 50% of the mass of any radioactive sample to decay,
Therefore for iodine-131 to decay by 50
percent, we just need one halflife and halflife is 8.02 days . therefore it will take 8.02 days for
it to ecay by 50 percent.
But how much is 0.02 days
If
1days =
24hrs =
0.02days = x
Xdays = 24 *
0.02
=0.48hrs
0.48hrs =
0.48 * 60 minutes
28.8 minutes
And how much is
0.8 minutes
0.8 minutes
= 0.8 * 60 seconds
= 48 seconds
Therefore
It will take
8 days and 28 minutes and 48 seconds for
50% of the sample of iodine-131 to be lost.
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