A 40-mg sample of pure 226 ra is encapsulated how long, Electrical Engineering

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A 40-mg sample of pure 226 ra is encapsulated how long

1. Consider the following 13 decay chain with the half-lives indicated,

210 (22y) -> 210Bi (5d)-> 210P₀

A sample contains 30 MBq of 210 Pb and 15 lVIBq of 210Bi at time zero.

(a) Calculate the activity of 210Bi at time t = 10 d.

(b) If the sample were originally pure 210 Pb. how old would it have been at time t = O?

2. A 40-mg sample of pure 226 Ra is encapsulated.

(a) How long will it take for the activity of 222 Rn to build up to 10 mCi?

(b) What will be the activity of 222 Rn after 2 years?

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Electrical Engineering: A 40-mg sample of pure 226 ra is encapsulated how long

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Electrical Engineering: A 40-mg sample of pure 226 ra is encapsulated how long

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