Final answer:
Increased exposure factors for a wrist X-ray are likely required for lateral projections of a thick or cast-covered limb and may also be necessary when imaging the distal radius if the radiocarpal joint is involved in a fracture.
Step-by-step explanation:
The exposure factors for a routine wrist X-ray might need to be increased when imaging projections that require penetration through greater amounts of soft tissue or bone, such as the lateral projection in the case of a thickened or plaster-wrapped limb.
When imaging these denser areas, radiographic technicians may need to increase the kilovoltage (kV) and/or milliamperage (mA) to ensure sufficient penetration and adequate image quality. Specifically, projections involving the distal radius could require a higher exposure if the joint surface is compromised, as mentioned in the context of a fracture involving the radiocarpal joint.
An increase in exposure may also be warranted in settings where workers are exposed to factors that enhance absorption or inhalation of substances, a situation referenced with respect to occupational exposures.