Final answer:
The statement about entrance skin exposure being the area of maximum exposure when X-radiation enters the patient's body is true. Care is taken to minimize overexposure to prevent health risks like cancer. Protective measures are important in jobs with increased radiation exposure, such as medical imaging and nuclear power.
Step-by-step explanation:
The statement about entrance skin exposure refers to the point at which X-radiation enters the patient's body and is indeed an area of maximum exposure. This is true because the X-rays first interact and are absorbed by the skin and the underlying tissues at the entry point, before they can scatter or attenuate. When X-rays are used for medical imaging, care is taken to minimize the exposure and prevent overexposure, which can lead to detrimental health effects such as the increased risk of cancer. Sensitive cells, such as those in bone marrow and reproductive organs, are particularly susceptible to damage. Medical professionals use shielding and limit exposure time to protect both patients and themselves.
Jobs that involve increased risk of radiation exposure include those in healthcare settings where diagnostic imaging is frequent, nuclear power plants, and certain types of research laboratories where radioactive materials are used. The health hazards are related to the high energy and penetrating ability of electromagnetic waves like X-rays and gamma rays. Protective measures against UV radiation from the sun, similar to those against X-rays, are commonly used such as sunscreen and clothing, due to the harm these rays can cause to cells.