Question

It has become popular for some people to have yearly whole-body scans (CT scans, formerly called CAT scans), using x-rays, just to see if they detect anything suspicious. A number of medical people have recently questioned the advisability of such scans, due in part to the radiation they impart. Typically, one such scan gives a dose of 12 mSv, applied to the whole body. By contrast, a chest x-ray typically administers 0.20 mSv to only 6.0 kg of tissue. How many chest x rays would deliver the same total amount of energy to the body of a 85 kg person as one whole-body scan?

Answer 1

Answer:

Explanation:

Given

One CT scan gives a dose of 12 mSv

and a chest X ray typically administer 0.2 mSv to 6 kg tissue

mass of Person $m=85 kg$

therefore $\frac{85}{6}=14.167$

N no of x-Ray equals to 12 mSv dose of CT scan

$n=\frac{12}{0.2}=60$

Therefore total no of x ray required is $=60\times 14.167=850.02\approx 850 X rays$