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A freshly prepared radioactive material has an half life 2 years.It emits radiaion which is 64 times the permissibile safe level dose.The min. time after which it would be possible to work safely with the source is_____________
Let the permissible radiation level be K. Current emission is 64K
In 2 years, it will emit 32K
In 4 years, it will emit 16K
in 6 years, it emits 8K
and so on
In 12 years, the sample will emit radiation at level K, which is suitable for work
half-life period = 2 yrs
since it emits 64 times the permissible level
time after which it works safrly is : 2n=64
n=6 half lifes
so, after 12 years , its safe to work with radioactive material
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