| 1.68 | critical value, Lc | ||
| critical level | |||
| decision level | |||
| Measured quantity value for a quantity of a component in a material, above which the component is declared to be present. | |||
| Note 1: | The critical value is usually considered to be a characteristic of a particular measurement procedure, performed in a particular laboratory. | ||
| Note 2: | In some European legislation the term “decision level” (there denoted CCα) is used for the concept ‘critical value’.37 | ||
| Note 3: | The quantity measured is usually a mass fraction or a concentration but can also be for example, a mass or amount of substance. | ||
| Note 4: | The critical value is chosen to give a probability α (usually 0.05) of a measured quantity value exceeding the critical value when the component is absent. | ||
| Note 5: | The detection decision is made by comparing a measured quantity value with the critical value. | ||
| Note 6: | Another important concept in characterizing the ‘capability of detection’38 of measurement procedures is limit of detection. | ||
| See also: ref. 39. Source: ref. 2 with added reference. | |||
| 1.68 | critical value, Lc | ||
| critical level | |||
| decision level | |||
| Measured quantity value for a quantity of a component in a material, above which the component is declared to be present. | |||
| Note 1: | The critical value is usually considered to be a characteristic of a particular measurement procedure, performed in a particular laboratory. | ||
| Note 2: | In some European legislation the term “decision level” (there denoted CCα) is used for the concept ‘critical value’.37 | ||
| Note 3: | The quantity measured is usually a mass fraction or a concentration but can also be for example, a mass or amount of substance. | ||
| Note 4: | The critical value is chosen to give a probability α (usually 0.05) of a measured quantity value exceeding the critical value when the component is absent. | ||
| Note 5: | The detection decision is made by comparing a measured quantity value with the critical value. | ||
| Note 6: | Another important concept in characterizing the ‘capability of detection’38 of measurement procedures is limit of detection. | ||
| See also: ref. 39. Source: ref. 2 with added reference. | |||