Question

What is the inverse square law when the exposure from an x-ray tube operated at 70kVp, 200mAs is 400 mR at 90 cm. What will be the exposure at 180 cm?

Answer 1

The inverse square law for radiation states that the intensity of a radiation source decreases as the distance from the source increases. To find the exposure at 180 cm, we can use the inverse square law formula.

Step-by-step explanation:

The inverse square law states that the intensity of a radiation source decreases as the distance from the source increases. This can be expressed mathematically as:

I1 / I2 = (D2 / D1)²

In this case, the exposure at 90 cm is 400 mR, and we want to find the exposure at 180 cm.

Using the inverse square law formula, we have:

400 mR / X = (180 cm / 90 cm) ²

X = 400 mR * (90 cm / 180 cm)².