The absorption of how many ergs of air represents one roentgen?

One roentgen is defined as the amount of ionizing radiation that produces a particular amount of ionization in air. Specifically, one roentgen corresponds to the absorption of about 83 ergs of energy per gram of air. In the context of the options provided, "About 86" is closest to this value, recognizing that various sources may round or express this in slightly different ways.

Understanding the significance of the roentgen in radiation protection is crucial, as it provides a way to quantify exposure to ionizing radiation. This measurement helps in assessing the potential biological impact of radiation on living tissues. In practice, knowing that one roentgen represents approximately 86 ergs of air allows radiation protection professionals to evaluate and manage radiation doses effectively.

While the exact absorption can vary somewhat based on different interactions and conditions, the figure of 86 remains a widely accepted approximation for educational and practical purposes in the field of radiation protection.