A radiation detection instrument measuring the equivalent dose rate displays units in:

When measuring equivalent dose rate, the correct units are in Sieverts per hour (Sv/hr). The equivalent dose is concerned with the biological effect of radiation on human tissue, and the Sievert is the SI unit used to quantify this effect, taking into account the type of radiation and its impact on health.

The reason this is the most appropriate choice is that Sieverts allow for a comparison between different types of radiation, providing a more accurate assessment of the potential biological effect. This is particularly important in radiation protection and health physics, where understanding the risks associated with specific doses of radiation is crucial for safety.

In contrast, Rad per hour and Gray per hour are units of absorbed dose, which measure how much energy radiation transfers to a material, but they do not account for the different biological effects of various types of radiation. The Curie, on the other hand, is a unit of radioactivity, reflecting the decay rate of radioactive materials rather than the biological consequences of exposure. Thus, when discussing equivalent dose rates in a context that emphasizes biological risk, Sieverts per hour is the appropriate and most relevant measurement.