If a radiographic image is properly darkened in two seconds at 10 mA, it would have the same darkness in one second at which mA?

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Explore the ADAA Intro to Basic Concepts in Dental Radiology Test. Prepare with flashcards and multiple-choice questions. Master radiology concepts for certification!

Multiple Choice

If a radiographic image is properly darkened in two seconds at 10 mA, it would have the same darkness in one second at which mA?

Explanation:
Density on a radiograph depends on the total exposure, which is the product of the tube current (mA) and the exposure time (seconds) at a fixed kilovoltage. If you shorten the exposure time from two seconds to one second, you must double the tube current to keep the same exposure. So, 10 mA for two seconds equals 20 mA for one second, yielding the same darkness.

Density on a radiograph depends on the total exposure, which is the product of the tube current (mA) and the exposure time (seconds) at a fixed kilovoltage. If you shorten the exposure time from two seconds to one second, you must double the tube current to keep the same exposure. So, 10 mA for two seconds equals 20 mA for one second, yielding the same darkness.

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