Chapter 10, Problem 10B.12E

Interpretation Introduction

Interpretation:

The mass of technetium-99m will remain when it arrives at the hospital has to be given.

Concept Introduction:

The radioactive law states that the probability per unit time that a nucleus will decay is a constant independent of time.  This constant is called the decay constant and is denoted by $\text{k}$.  This constant probability may vary greatly between different types of nuclei, leading to the many different observed decay rates.  The radioactive decay of certain number of atoms (mass) is exponential in time.

Radioactive decay law,

  ${\text{N = N}}_{\text{0}}{\text{.e}}^{\text{-kt}}$

Where N is the number of radioactive nuclei remaining after time t.

N₀ is the number of radioactive nuclei in initial time.

k is the decay constant.

t is the time required to decay.