IEC 62976:2017 pdf download

IEC 62976:2017 pdf download.Industrial non-destructive testing equipment – Electron linear accelerator
1 Scope
This document gives the rules of naming, technical requirements, test methods, inspection, marking, packaging, transportation, storage and accompanying documents for electron linear accelerator equipment for Non-Destructive Testing (NDT). This document applies to NDT electron linear accelerator equipment in the X-ray energy range of 1 MeV to 1 5 MeV, including the accelerator equipment for radiographic film, computed radiography with imaging plates, real-time imaging, digital detector array and industrial computerized tomography.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO/IEC Guide 37:201 2, Instructions for use of products by consumers ISO 780:201 5, Packaging – Distribution packaging – Graphical symbols for handling and storage of packages ISO 1 9232-1 :201 3, Non-destructive testing – Image quality of radiographs – Part 1: Determination of the image quality value using wire-type image quality indicators
3 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 target area on the surface of accelerating tube outlet on which the electron beam impinges and from which the primary beam of X-rays is emitted 3.2 linear electron accelerator LINAC apparatus for producing high energy electrons by accelerating them along a waveguide. The electrons strike a target to produce X-rays Note 1 to entry: NDT electron linear accelerator, hereinafter referred to as the accelerator. [SOURCE: ISO 5576:1 997, 2.84]3.3 X-rays penetrating electromagnetic radiation, within the approximate wavelength range of 1 nm to 0,0001 nm, produced when high velocity electrons impinge on a metal target [SOURCE: ISO 5576:1 997, 2.1 29] 3.4 X-ray beam energy E maximum X-ray energy in the continuous emission spectrum, equal to the product of the electron charge and the accelerating voltage Note 1 to entry: E is expressed in megaelectronvolts (MeV). 3.5 wedge X-ray field X-radiation field with a dose distribution that changes approximately linearly with distance from the beam edge along a line perpendicular to and passing through the radiation beam axis [SOURCE: IEC 60976, 2007, 3.32] 3.6 half-value layer thickness of a specified material, which attenuates under narrow beam conditions X- radiation with a particular spectrum to an extent such that the air kerma rate, exposure rate or absorbed dose rate is reduced to one half of the value that is measured without the material. The half-value layer (HVL) is expressed in suitable submultiples of the metre together with the material [SOURCE: IEC 60601 -1 -3, 2008, 3.27] 3.7 X-ray beam focal spot d dimension across the focal spot of an accelerating tube, measured perpendicular to the central beam axis Note 1 to entry: d is expressed in millimetres (mm). 3.8 X-ray beam homogeneity ratio, expressed as a percent, of the dose rate in a plane 1 m from the target and normal to the beam central axis, and acquired at a specified angle from the central axis, to the dose rate in the plane and on the beam axis 3.9 X-ray beam air kerma rate K volume of ionization caused by the x-ray beam in air per unit time at 1 m away from target Note 1 to entry: K is expressed in centigrays per minute (cGy/min). 3.1 0 X-ray beam asymmetry ratio of the difference to the average values of the dose rates measured at equal distances from the central beam axis and in a vertical plane normal to the x-ray beam