Chapter 21, Problem 81E

Interpretation Introduction

Interpretation:

‘ Number of beta emission and amount of radiation in Ci’ should be identified.

Concept introduction:

Disintegration of bismuth taking place and emission of alpha particles take place. Therefore, the mass which gets disintegrated can be calculated by deducting the mass left of Bi from initial mass of Bi as following.

      m₀−m

And thus, by multiplying the disintegrated mass with the Avogadro’s number of 210 g of Bi, the number of emission can be determined.

Given:

${\text{T}}_{1/2}$

t = 13.5 d

Mass of Bi = 1.2 g