An ordinary chest x-ray produces an exposure of about 0.1 rad; a very heavy diagnostic series produces about how many rads?

The exposure from a very heavy diagnostic x-ray series is significantly higher than that of an ordinary chest x-ray. An ordinary chest x-ray provides an exposure of about 0.1 rad, which is relatively low. In medical imaging, a heavy diagnostic series often involves multiple images or more complex procedures that require increased radiation exposure.

Typically, a very heavy series can range from approximately 5 rads to 10 rads, depending on the specific series and the area of the body being examined. While several options reflect considerable exposures, 10 rads is commonly cited as a representative dose for extensive x-ray procedures in clinical settings. This value highlights the substantial difference in radiation dose between simple imaging and comprehensive diagnostic series, emphasizing the importance of understanding radiation exposure in medical diagnostics and ensuring appropriate safety measures. Thus, 10 rads stands out as a fitting exposure figure for a very heavy diagnostic series, making it the correct answer.