American Society of Radiologic Technologist (ASRT) Practice Exam

The DAP meter provides a measure of what aspect of radiation in radiology?

1. Exposed dose

2. Effective dose

3. Radiation intensity

4. Radiation dose area

The correct answer is: Radiation dose area

The DAP (Dose Area Product) meter measures the total amount of radiation delivered to a patient, taking into account both the radiation dose and the area over which that dose is delivered. This measurement is significant in radiology as it provides insight into the potential biological effect of the radiation exposure, integrating both dose and the size of the radiation field. By calculating DAP, radiologic technologists can better assess and manage the risks associated with exposure to radiation. It is particularly useful for evaluating the dose in interventional radiology and other procedures where the area exposed can vary significantly. In contrast, other choices focus on narrower aspects of radiation exposure. For example, the exposed dose refers specifically to the amount of radiation received by a patient but does not incorporate the area aspect. The effective dose is calculated to reflect the risk of radiation exposure across different tissues and organs rather than measuring the dose directly. Radiation intensity measures the strength of radiation at a specific point, but does not account for the area affected. Thus, the DAP meter's focus on both dose and area makes it a vital tool in providing a comprehensive measurement related to patient radiation exposure.