Radiation Unit Converter

Radiation measurements describe several different physical ideas, so a safe converter must keep their units in compatible families. Activity describes how many nuclear decays occur per second. Absorbed dose describes energy deposited in matter. Equivalent dose accounts for the biological weighting of radiation. A becquerel therefore cannot be converted directly into a gray or sievert without additional information about the source, exposure, material, and radiation type. For equivalent dose, the sievert is the International System unit and the rem is a traditional unit. One sievert equals 100 rem. A millisievert is one thousandth of a sievert, a microsievert is one millionth, and a millirem is one thousandth of a rem. Thus 100 millisieverts equal 10 rem. These units are used in radiation protection, occupational monitoring, medical discussions, and public exposure guidance. For absorbed dose, the gray is the International System unit. One gray means one joule of ionizing radiation energy absorbed per kilogram of matter. One gray equals 100 rad, while one milligray is one thousandth of a gray. Absorbed dose and equivalent dose can have the same numeric value only under particular radiation weighting assumptions, so this calculator deliberately prevents direct conversion between gray and sievert families. Radioactivity is measured in becquerels and curies. One becquerel is one nuclear decay per second. One curie is exactly 37 billion becquerels, based historically on the activity associated with radium. Kilobecquerels and megabecquerels scale by one thousand and one million, while millicuries and microcuries scale the curie by one thousandth and one millionth. Choose the measurement type before selecting units. This limits the lists to physically compatible choices and avoids implying a relationship that cannot be calculated from units alone. The converter uses standard decimal prefixes and exact conventional factors. It can assist with unit checks in medicine, radiation safety, nuclear science, environmental reports, and equipment documentation. A numerical conversion does not determine whether an exposure or activity is safe. Health significance depends on radiation type, exposure pathway, duration, distance, shielding, affected tissue, and regulatory context. Use calibrated instruments, official records, and qualified radiation-safety professionals for real exposure decisions. This tool provides unit arithmetic rather than medical, occupational, or emergency advice.