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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_____________

11 years ago

Answers : (3)

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

11 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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Please feel free to post as many doubts on our disucssion forum as you can. If you find any question difficult to understand - post it here and we will get you the answer and detailed solution very quickly. We are all IITians and here to help you in your IIT JEE preparation. All the best.

Regards,
Naga Ramesh
IIT Kgp - 2005 batch

11 years ago
Kushagra Madhukar
askIITians Faculty
605 Points
							
Dear student,
Please find the solution to your problem below.
 
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.
 
Hope it helps.
Thanks and regards,
Kushagra
3 months ago
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