Question

A 75 kV x-ray machine gives an exposure of 200 mR for a 0.2-sec chest x-ray exam.

Answer 1

Explanation:

Given that,

Potential = 75 kV

Exposure = 200 mR

Time = 0.2 sec

We need to calculate the x-ray fluence during this chest x-ray exam

Using formula of fluence

$x-ray\ fluence=exposure\times time$

Put the value into the formula

$x-ray\ fluence=200\times0.2$

$x-ray\ fluence=40\ mRs$

We need to calculate the energy fluence

Using formula of energy fluence

$E_{f}=40\times10^{-3}\times75\times10^{3}$

$E_{f} = 3000\ J$

We need to calculate dose -equivalent delivered to the bone, muscle, and fat

Using formula of dose

$D=\dfrac{E}{t}$

Where, D = dose

E = energy

t = time

Put the value into the formula

$D=\dfrac{3000}{0.2}$

$D=15.0\ kJ$

Hence, This is the required solution.