- QF Quality factor.
- QUALITY FACTOR The linear-energy-transfer -dependent factor by which absorbed dose is multiplied to obtain dose equivalent.
- QUALITY OF RADIATION Penetration of radiation: frequently measured by its halfvalue layer, the thickness of some standard material which transmits 50% of the incident radiation. NM.
- QUANTUM YIELD The number of moles transformed in a specified process, physically (e.g., by emission of photons) or chemically, per mole of photons absorbed by the system. C.
- QUENCHING 1. The process of inhibiting continuous or multiple discharges following a single ionizing event in certain types of radiation detectors), particularly in (Geiger- Müller counter tubes. 2. The deactivation of an electronically excited state by nonradiative process, e.g., as a source of error when using liquid scintillation detectors. 3. The shortening of the lifetime of positronium by its interaction with other species. partial.
- QUENCHING CORRECTION Correction for errors due to different quenching for standards and test portions. When using liquid scintillation detectors , these corrections can be based on the standard addition or sample channels ratio method, or the use of automated external standardization.
- Q-VALUE In a nuclear transformation, the energy equivalent of the difference in atomic masses between the reactants and products, all in their nuclear ground states.
- Qo-VALUE The ratio of resonance integral to thermal cross section in activation analysis.