What unit is designated for occupational exposure?

What unit is designated for occupational exposure?

• A. rem
• B. Rad
• C. Roentgen
• D. Gray

Answer: (A)

The unit designated for occupational exposure is the rem. This unit is specifically used to quantify the biological effect of ionizing radiation on human tissue, taking into account the type of radiation and its impact on health. The rem stands for "roentgen equivalent man" and is particularly important because it incorporates the quality factor (Q) to reflect the different biological effects of various types of radiation (such as alpha particles versus gamma rays) on human tissues.

In the context of radiation safety and protection, measuring occupational exposure in rem allows for a more accurate assessment of the potential risk to a worker's health. It is essential for setting radiation dose limits and ensuring that occupational exposures are kept below established safe thresholds.

Other units such as rad, roentgen, and gray have their specific uses. The rad measures the ionizing radiation absorbed dose but does not take biological effect into account. Roentgen measures the ionization of air but also doesn't translate directly to biological effects in tissue. The gray is a measure of absorbed dose and, like the rad, does not address biological impact. Therefore, for evaluating occupational exposure specifically, the rem is the appropriate unit to use.