ISO 31-10
From Wikipedia, the free encyclopedia
Part of international standard ISO 31
ISO 31-10 is the part of international standard ISO 31 that defines names and symbols for quantities and units related to nuclear reactions and ionizing 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 The standard was withdrawn in 2009 and replaced by ISO 80000-10.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 = ×ばつ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 of D, Q and N, at the point of interest in tissue, where D is the absorbed dose, Q is the quality factor and N is the product of any other modifying factors H = D · Q · N For Q and N, see CIPM, 1984, Recommendation 1 and ICRU Report 33 (1980) |
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 |
| ⋮ | ||||||
External links
[edit ] Stub icon
This standards- or measurement-related article is a stub. You can help Wikipedia by adding missing information.