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This standard for determination of gamma-ray efficiencies of germanium semiconductor detectors was developed in recognition of the increasing number of large-volume, low-activity samples being measured by gamma-ray spectroscopy. The standardized sample geometry and measurement techniques described, when used in conjunction with the relative efficiency measurement standard ANSI/IEEE Std 325-1971 (Reaff 1977), Test Procedures for Germanium Gamma-Ray Detectors, provide a meaningful assessment of detector performance. It is recognized that many Marinelli beaker geometries are in use. However, the object of this standard is to specify a single configuration for the sole purpose of characterizing detector performance.
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Irradiation. --- Gamma rays. --- Gamma rays. --- Irradiation.
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Germanium detectors are extensively used for the detection and analysis of gamma-radiation primarily because of their excellent energy resolution. The rapid development and utilization of these detectors in a variety of technical disciplines have made standard test procedures desirable so that measurements may have the same meaning to all manufacturers and users.These test procedures are not intended to imply that all tests described herein are mandatory,but only that such tests as are carried out on completed devices should be performed in accordance with these recommended procedures. These test procedures are a supplement to the following documents: IEEE Std 300-1969, Test Procedure for Semiconductor Radiation Detectors, (ANSI N42.1-1969) and IEEE Std 301-1969, Test Procedure for Amplifiers and Preamplifiers for Semiconductor Radiation Detectors, (ANSI N42.2-1969).
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This standard establishes methods for performance testing, calibration, and usage of NaI(Tl) detector systems for the measurement of gamma ray emission rates of radionuclides; the assay for radioactivity; and the determination of gamma ray energies and intensities. It covers both energy calibration and efficiency calibration.
Gamma rays --- Measurement --- Standards.
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This standard establishes methods for calibration and usage of germanium detectors for the measurement of gamma-ray emission rates of radionuclides. It covers the energy and full-energy peak efficiency calibration as well as the determination of gamma-ray energies in the 0.06 to 2 MeV energy region and is designed to yield gamma-ray emission rates with an uncertainty of +or-3 percent. This standard applies primarily to measurements which do not involve overlapping peaks, and in which peak to continuum considerations are not important.
Gamma rays --- Measurement --- Standards.
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The minimum performance criteria for active interrogation systems in homeland security applications are described in this standard. These systems are intended for non-intrusive inspection of closed containers, vehicles, and packages of a wide range of types and sizes. In these systems, the contents of an inspection zone are irradiated with penetrating ionizing radiation to determine the presence of a hidden substance-of-interest by the analysis of stimulated secondary radiations or absorption spectra that are indicative of the elemental and/or isotopic composition of the substances-of-interest (special nuclear material, explosives, chemical warfare agents).
Explosives. --- Gamma rays. --- Neutrons.
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