I don't like using formulae and equations unless absolutely necessary, they tend to stop the thinking process ...Better derive the equation myself from first principles ,
The question is how long will it take for the decay rate to reduce a thousand fold ...
When the Half life 30.1 years
after one half life it's a half....2HL it's a 1/4 .....3 HL it's an 1/8 ..... 4 HL it's a 1/16th
So if X is the number of half lifes then the radiation will be **One over 2 to the power X**
2 to the power 10 is 1024 ... but we want the number which will give a 1,000 ...it should be just less then 10.
Using my calculator I get an exact value of ** 9.9658 half lives ** = Almost exactly 300 years ( 299.97)
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Last edited by oz93666; Mar 18th 2018 at 08:36 PM.
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