IEC 62372:2021 pdf download

IEC 62372:2021 pdf download.Nuclear instrumentation – Housed scintillators – Test methods of light output and intrinsic resolution
1 Scope
This document is applicable to housed scintillators for registration and spectrometry of alpha-, beta-, gamma-, X-ray and neutron radiation. The main parameters, such as a light output and intrinsic resolution are established. This document specifies the requirements for the testing equipment and test methods of the basic parameters of housed scintillators, such as: • the direct method is applicable to measure the light output of housed scintillators based on scintillation material. The housed scintillators certified by this method can be used as working standard of housed scintillators (hereinafter: working standard) when performing measurements by a relative method of comparison. • the relative method of comparison with the working standard is applicable to housed scintillators based on the same scintillation material as the working standard. This document does not apply to gas or liquid scintillators and scintillators for counting and current modes. The numerical values of the parameters are set to the specific type of scintillators in the specifications.
2 Normative references
There are no normative references in this document.
3 Terms, definitions, symbols and abbreviated terms
3.1 Terms and definitions  For the purposes of this document, the following terms and definitions apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: • • IEC Electropedia: available at http://www.electropedia.org/ ISO Online browsing platform: available at http://www.iso.org/obp 3.1.1 scintillator luminescent material, usually liquid or solid, showing radioluminescence with a short afterglow [SOURCE: IEC 60050-845:1987, 845-04-37] 3.1.2 housed scintillator scintillator, housed in a container with a reflector and optical window 3.1.3 scintillation detector radiation detector consisting of a scintillator that is usually optically coupled to a photosensitive device, directly or through light guides Note 1 to entry: The scintillator consists of a scintillating material in which the ionizing particle produces a burst of luminescence radiation along its path. A common scintillator is NaI(Tl). [SOURCE: IEC 60050-395:2014, 395-03-01] 3.1.4 assembly light protective chamber containing a housed scintillator, photomultiplier (PMT), PMT voltage divider Note 1 to entry: Assembly is used for testing of the housed scintillator. 3.1.10 working standard working standard of housed scintillator that is used to check the measuring system and to measure the light output by a method of comparison 3.1.11 full width at half maximum FWHM in a distribution curve comprising a single peak, the distance between the abscissa of two points on the curve whose ordinates are half of the maximum ordinate of the peak Note 1 to entry: If the curve considered comprises several peaks, a full width at half maximum exists for each peak. 3.1.12 expanded uncertainty expanded uncertainty quantity defining an interval about the result of a measurement that may be expected to encompass a large fraction of the distribution of values that could reasonably be attributed to the measurand Note 1 to entry: The fraction may be viewed as the coverage probability or level of confidence of the interval. Note 2 to entry: To associate a specific level of confidence with the interval defined by the expanded uncertainty requires explicit or implicit assumptions regarding the probability distribution characterized by the measurement result and its combined standard uncertainty. The level of confidence that may be attributed to this interval can be known only to the extent to which such assumptions may be justified. [SOURCE: JCGM 100:2008, 2.35] 3.1.13 relative expanded uncertainty ratio of the expanded uncertainty of a measurement to average value of quantity. It expresses the relative size of the uncertainty of a measurement (its precision)
4 Test methods of basic parameters of housed scintillators
4.1 General 4.1.1 Test conditions Measurements shall be made under normal conditions, unless otherwise specified in the specifications of the manufacturer of housed scintillators. Measurements should start at least 0,5 h after the last device has been switched on, unless otherwise specified by the manufacturer specifications. Before measuring, the housed scintillator and the PMT is kept under high voltage for the time necessary for getting to the operation condition. Before measuring, the PMT is kept under high voltage for the time necessary for getting to the operation condition. All parameters are measured during the complete blackout of the housed scintillator and PMT. Optical contact between the housed scintillator and the PMT is provided by the material specified in the manufacturer specifications of the housed scintillator.