| NOUN | quantity | radioactivity unit | a measure of radioactivity |
|---|
| Meaning | A measure of radioactivity. | |
|---|---|---|
| Narrower | curie, Ci | A unit of radioactivity equal to the amount of a radioactive isotope that decays at the rate of 37,000,000,000 disintegrations per second |
| gray, Gy | The SI unit of energy absorbed from ionizing radiation | |
| millicurie | A unit of radioactivity equal to one thousandth of a curie | |
| mrem, millirem | A dosage of ionizing radiation equivalent to one thousandth (1/1000) of a rem | |
| rad | A unit of absorbed ionizing radiation equal to 100 ergs per gram of irradiated material | |
| rem | (roentgen equivalent man) the dosage of ionizing radiation that will cause the same amount of injury to human tissue as 1 roentgen of X-rays | |
| roentgen, R | A unit of radiation exposure | |
| rutherford | A unit strength of a radioactive source equal to one million disintegrations per second | |
| Broader | electromagnetic unit, emu | Any of various systems of units for measuring electricity and magnetism |
| Spanish | unidad de radioactividad | |
| Catalan | unitat de radiació | |
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