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Chapter 5: Q. 5.67 (page 165)

A 120-mgsample of technetium-role="math" localid="1652175464491" 99mis used for a diagnostic test. If technetium- 99mhas a half-life of 6.0h. how many milligrams of the technetium-99msample remains active 24hafter the test? (5,4)

Short Answer

Expert verified

The value of the expression is116.

Step by step solution

01

Step 1- Given information 

We are given that

N0=120mg,t=24hr,t12=6.0hrN=?

The amount of radioactive sample (N) is known to remain after the nhalf-life =N02n

Ne= initial amount of radioactive material

N=Number of half periods=tt12

02

Step 2- Explanation 

Replace the value of the expression

NN0=121t1

N120mg=1224mr6.04r

N120mg=124

orN120mg=116

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