This International Standard establishes methods for performance testing, calibration and usage of Nal (TI) detector systems for the measurement of gamma-ray energies and emission rates of radionuclides and the assay for radioactivity. This standard provides a standardized basis for the calibration and usage of sodium iodide detector systems for the measurement of gamma-ray emission rates of radionuclides. Typical applications include radionuclide identification and assay in various industrial, environmental, and medical applications. A thallium activated sodium iodide detector system consists of three major components: a scintillating medium that produces photons of light when ionizing radiation interacts with it; one or more photomultipliers or photodiodes, optically coupled to the scintillator, which converts the light photons to an amplified electrical pulse or pulses; and associated electronic instrumentation which powers the photomultiplier and processes the output signal. Both energy calibration and efficiency calibration are covered. The following three techniques are considered: a) total spectrum counting (see 4.1) which employs a system that counts all pulses above a low-energy threshold (see 6.1, 6.2 and 6.3); b) single-channel analyzer counting (see 4.2) which employs a system with a counting window which establishes upper and lower energy boundaries (see 6.1, 6.2, and 6.3); c) multichannel analyzer counting (see 4.3) which employs a system in which multiple counting windows are utilized. This technique allows measurements for which the continuum under the full-energy peak may be subtracted without introducing unacceptable error. In case of overlapping peaks in the spectrum, it is realized that a multichannel analyzer (MCA) with access to a spectrum-stripping program is necessary. This case is not covered by this standard.
IEC 61453-1997由国际电工委员会 IX-IEC 发布于 1997-03,于 2007-08 废止。
IEC 61453-1997 在中国标准分类中归属于: F81 通用核仪器,在国际标准分类中归属于: 27.120.20 核电站、安全。
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