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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_____________

8 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

8 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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Naga Ramesh
IIT Kgp - 2005 batch

8 years ago
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