What units are commonly used to measure radiation dose?

The units Sieverts (Sv) and rems are specifically designed to measure radiation dose and the biological effects of ionizing radiation on human tissue. The sievert is the SI unit used internationally, while the rem is a traditional unit still recognized, especially in the United States. These units take into account the type of radiation and its impact on different kinds of biological tissues, making them appropriate for assessing the potential health risks associated with exposure to radiation.

In context, the other options listed refer to units that are either unrelated to radiation measurements or pertain to completely different concepts. Meters and kilometers measure distance, not radiation. Seismics and decibels pertain to geological and sound measurements, respectively, and have no relevance in the context of radiation dosage. Watts and joules are units of energy and power, which do not provide an assessment of radiation exposure or its biological implications. Thus, the selection of Sieverts and rems is correct for discussing measures of radiation dose.