IEC 62438 pdf download

IEC 62438 pdf download Radiation protection instrumentation – Mobile instrumentation for the measurement of photon and neutron radiation in the environment
1 Scope and object
This International Standard is applicable to mobile radiation detection systems used for the detection, quantification and identification of photon and/or neutron emitters in the environment. This includes point and distributed radiation sources.
The object of this standard is to:
• establish definitions;
• establish minimum requirements for the instrumentation;
• establish requirements for deployment and operations;
• provide test and calibration methods; and
• provide guidance to procurement for appropriate equipment.
In general, mobile instrumentation systems for nuclear radiation measurements in the environment are comprised of detectors, detector signal processors, position sensing devices, on-board data recording, operational monitoring, and real time display/alarm capabilities. In addition, advanced systems may provide data streams that can be transmitted by telemetry to operations centres.
2 Normative references
The following referenced documents are indispensable for the application 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.
IEC 60050-393:2003, International Electrotechnical Vocabulary (IEV) – Chapter 393: Nuclear instrumentation – Physical phenomena and basic concepts
IEC 60050-394:2007, International Electrotechnical Vocabulary (IEV) – Part 394: Nuclear instrumentation – Instruments, systems, equipment and detectors
IEC 60068-1 :1 988, Environmental testing – Part 1: General and guidance
IEC 60068-2-6:2007, Environmental testing – Part 2-6: Tests – Test Fc: Vibration (sinusoidal)
IEC 60068-2-1 4:2009, Environmental testing – Part 2-14: Tests – Test N: Change of temperature
IEC 60068-2-30:2005, Environmental testing – Part 2-30: Tests – Test Db: Damp heat, cyclic (12 h + 12 h cycle)
IEC 60086 (all parts), Primary batteries
IEC 60529:1 989, Degrees of protection provided by enclosures (IP Code)
IEC 60973:1 989, Test procedures for germanium gamma-ray detectors
3 Terms, definitions and nomenclature 3.1 Definitions For the purposes of this document, the following terms and definitions apply. Except as specified below, all technical terms are as defined in IEC 60050, particularly for radiation quantities and dosimetric terms defined in IEC 60050-393 and IEC 60050-394.
3.1.1 mobile detection system mobile detection systems consist of a suitable number of radiation detectors mounted on an transportable platform, which are capable of making measurements while moving (see Figure 1 ) .
NOTE This may include but is not limited to fixed and rotary winged aircraft, surface vehicles, ocean towing, and amphibious vehicles.
3.1.2 energy resolution
the full width in percent or keV at half maximum at a defined total absorption peak (see Annex A)
3.1.3 background (intrinsic, platform and cosmic)
the measured count rate from photons in an energy spectrum or a given energy window or the measured count rate from neutrons from the detection system, platform and cosmic radiation (see Annex A)