Final answer:
If a radiograph is overexposed, you should decrease the mAs (milliampere-seconds).
Step-by-step explanation:
If a radiograph is overexposed, you should decrease the mAs (milliampere-seconds).
The mAs is a measure of the amount of radiation used to expose the film. If the radiograph is overexposed, it means that too much radiation was used, resulting in a darker image with less contrast. To fix this, you need to reduce the amount of radiation by decreasing the mAs setting on the X-ray machine.
For example, if the initial mAs setting was 10 mAs and the image is overexposed, you can try reducing it to 8 mAs and take another radiograph. This should result in a better-exposed image with improved contrast.