Chapter 21, Problem 76E

Interpretation Introduction

Interpretation:

’ Exposure of beta emitter in first four hours’ should be identified.

Concept introduction:

Exposure of beta emitter can be calculated by specific activity as follows:

$\text{SA}\text{ =}\frac{1\text{n}\left(2\right).{\text{N}}_{\text{A}}}{{\text{T}}_{1/2}.\text{U}}$

SA is specific activity

T_1/2 is half life

N_A is Avogadro number

Given:

Amount of I − 131 is given to patient = 155 μ g

Half-life = 8 days