Which exposure factors will produce the greatest receptor exposure?

To determine which exposure factors will produce the greatest receptor exposure, it is important to consider how mA (milliamperes) and exposure time (in milliseconds) combine to influence the overall exposure of the receptor. Receptor exposure is affected by the product of the mA and the time of exposure (ms). This calculation is often illustrated by the formula:

Exposure = mA × Time (in seconds)

First, let’s convert all milliseconds to seconds for easier multiplication.

• For the first choice, 100 mA for 50 ms:

100 mA × 0.050 s = 5 mAs (milliampere-seconds)

• For the second choice, 200 mA for 40 ms:

200 mA × 0.040 s = 8 mAs

• For the third choice, 400 mA for 70 ms:

400 mA × 0.070 s = 28 mAs

• For the last choice, 600 mA for 30 ms:

600 mA × 0.030 s = 18 mAs

Comparing the calculated mAs values, the third option, which combines 400 mA