ISO 31-10 is the part ofinternational standardISO 31 that defines names and symbols forquantities andunits related tonuclear reactions andionizing radiations. It gives names and symbols for 70 quantities and units. Where appropriate, conversion factors are also given. The standard was withdrawn in 2009 and replaced byISO 80000-10.
Its definitions include:
| Quantity | Unit | Remarks | ||||
|---|---|---|---|---|---|---|
| Name | Symbol | Definition | Name | Symbol | Definition | |
| ⋮ | ||||||
| activity | A | Expectation value of the number of spontaneous nuclear transitions from a particular energy state occurring in an amount of radionuclide in a small time interval, divided by that time interval | becquerel | Bq | 1 Bq = 1/s | The becquerel is a special name for second to the power minus one, to be used as the SI unit of activity. curie: 1 Ci = 3.7×1010 Bq (exactly) |
| ⋮ | ||||||
| absorbed dose | D | For any ionizing radiation, the mean energy imparted to an element of irradiated matter divided by the mass of this element | gray | Gy | 1 Gy = 1 J/kg | The gray is a special name for joule per kilogram, to be used as the SI unit for absorbed dose. rad: 1 rad = 0.01 Gy |
| dose equivalent | H | Product ofD,Q andN, at the point of interest in tissue, whereD is the absorbed dose,Q is the quality factor andN is the product of any other modifying factors H =D ·Q ·N ForQ andN, seeCIPM, 1984, Recommendation 1[1] andICRU Report 33 (1980)[2] | sievert | Sv | 1 Sv = 1 J/kg | The sievert is a special name for joule per kilogram, to be used as the SI unit for dose equivalent. rem: 1 rem = 0.01 Sv |
| ⋮ | ||||||
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