Final answer:
To produce a noticeable increase in radiographic density, a radiographer can increase the exposure to radiation, either by raising the kilovoltage (kV) or extending the exposure time. Such adjustments allow more X-rays to interact with the film, creating a darker image.
Step-by-step explanation:
To produce a just perceptible increase in radiographic density, the radiographer must increase the exposure to radiation. Specifically, an increase in the kilovoltage (kV) or the exposure time could lead to this effect. Higher energy X-ray photons provided by increasing the kV setting on an X-ray tube will penetrate materials more effectively, resulting in a darker image. This applies to various medical imaging scenarios, such as moving from a 50.0 kV setting for a chest X-ray to a 100 kV setting for imaging a limb encased in a cast. Moreover, increasing the exposure time also allows more X-rays to interact with the film, further darkening the image.
In the context of medical diagnostics, any increase in exposure must be carefully considered against safety standards to minimize the risk of harmful biological effects due to ionizing radiation. Modern radiography practices focus on reducing patient exposure by utilizing faster films or techniques that require a shorter exposure time, thus reducing the likelihood of tissue damage.