What unit measures the biological effects of radiation on tissues?

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The unit that measures the biological effects of radiation on tissues is the Sievert. The Sievert is specifically designed to account for the varying biological effects that different types of radiation can have on human tissue. It takes into consideration the type of radiation and the sensitivity of different tissues to that radiation, providing a more accurate assessment of potential biological harm or risk.

In contrast, the Rad is a unit that measures the absorbed dose of radiation in materials, but it does not take into account the biological impact. Therefore, while the Rad provides information about how much radiation is absorbed, it does not reflect the actual hazardous effects on living tissues.

The Rem is an older unit that also considers biological effects, similar to the Sievert, but it has largely been replaced by the newer unit due to the global standardization favoring the Sievert.

R, which stands for Roentgen, measures exposure to X-rays and gamma rays but does not relate to biological effects. Thus, Sievert is the most appropriate choice as it directly correlates the measure of radiation dose to its biological effects on human tissues, making it essential for assessing health risks associated with exposure to radiation.

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