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suchintan mondal Grade: 12
        

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_____________

7 years ago

Answers : (2)

AskIITians Expert Hari Shankar IITD
17 Points
										

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

7 years ago
Ramesh V
70 Points
										

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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Regards,

Naga Ramesh

IIT Kgp - 2005 batch

7 years ago
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