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IEC Standard 80000-14
Quantities and Units for RADIO-IN and RADIO-OUT
Table 6 Â Quantities, Units, and Definitions for the RADIO Modality
| RADIO-IN | and RADIO-OUT | QUANTITIES | | |
| Item No. | Name | Symbol | Definition | Remarks |
| 14-10.1 | activity fr activité (f) | A | amount of spontaneous nuclear transitions per unit of time | For exponential decay, A= λN, where λ is the decay constant. N is the amount of nuclei in the particular energy state considered. A half-life period is also commonly used, defined as the time it takes for the activity to reduce to half its original value. (For exponential decay, twice this time is needed for the activity to reduce to one quarter of its original value, and so on). |
| 14-10.2 | massic activity, specific activity fr activité (f) massiquea | activity divided by the total mass of the sample | | |
| 14-10.3 | exposure rate fr débit(m) d'exposition | X' | X'=dX/dt | |
| 14-10.4 | activity thresholds fr seuils (m) d'activité | Ŧr | thresholds of sensitivity to radioactivity | Thresholds depend on the nature of the radioactivity. |
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