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_____________

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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