Nuclear Chemistry: Solving Ionizing Intensity

[SamTsui86]

Homework Statement

If X radiation ionizes 26.2 X 1012 atoms per cemtimeter cubed, what is the ionizing intensity of the radiation measured in roentgens ?

Homework Equations

The Attempt at a Solution

Help, I have never seen atoms per centimeter cubed before, I know that 1 roentgens is 93.3e-3 J/g, but I don't know how to get atoms per centimeter cubed to that?

 

[chemisttree]

this from Wiki:

"It is the amount of radiation required to liberate positive and negative charges of one electrostatic unit of charge in 1 cm³ of air at standard temperature and pressure (STP). This corresponds to the generation of approximately 2.08×10^9 ion pairs."


You must determine how many ion pairs are generated per ionization event.
eg. 26.2 X 10^12 atoms generates how many ion pairs?