标准号：ISO/ASTM 51401-2003
实施状态：作废
中文名称：重铬酸盐剂量测定系统的使用规程
英文名称：Practice for use of a dichromate dosimetry system
发布日期：2003-07-15
被替代标准：ISO/ASTM 51401-2013
代替标准：ISO/ASTM 51401-2002;ISO/ASTM FDIS 51401-2002
起草单位：ISO/TC 85
标准简介：1 This practice covers the preparation, testing, and proce-dure for using the acidic aqueous silver dichromate dosimetry system to measure absorbed dose in water when exposed to ionizing radiation. The system consists of a dosimeter and appropriate analytical instrumentation. For simplicity, the sys-tem will be referred to as the dichromate system. It is classified as a reference standard dosimetry system (see ISO/ASTM Guide 51261).
2 This practice describes the spectrophotometric analysis procedures for the dichromate system.
3 This practice applies only to γ-rays, x-rays/ bremsstrahlung, and high energy electrons.
4 This practice applies provided the following conditions are satisfied:
4.1 The absorbed dose range is from 2 × 10<up3> to 5 × 10<up4> Gy.
4.2 The absorbed dose rate does not exceed 600 Gy /pulse (12.5 pulses per second), or does not exceed an equivalent dose rate of 7.5 kGy/s from continuous sources (1).<up2>
4.3 For radionuclide gamma-ray sources, the initial pho-ton energy shall be greater than 0.6 MeV. For bremsstrahlung photons, the initial energy of the electrons used to produce the bremsstrahlung photons shall be equal to or greater than 2 MeV. For electron beams, the initial electron energy shall be greater than 8 MeV.
Note 1—The lower energy limits given are appropriate for a cylindri-cal dosimeter ampoule of 12 mm diameter. Corrections for displacement effects and dose gradient across the ampoule may be required for electron beams (2). The dichromate system may be used at lower energies by employing thinner (in the beam direction) dosimeter containers (see ICRU Report 35).
4.4 The irradiation temperature of the dosimeter shall be above 0℃ and should be below 80℃.
Note 2—The temperature coefficient of dosimeter response is known only in the range of 5°to 50℃ (see 4.3). Use outside this range requires
determination of the temperature coefficient.
5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use. Specific precau-tionary statements are given in 8.3.
note: 2 The boldface numbers in parentheses refer to the bibliography at the end of this practice.
文件格式：PDF
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文件页数：11
（以上信息更新时间为：2019-11-23）
ISO_ASTM 51401-2003 重铬酸盐剂量测定系统的使用规程.pdf
(157.93 KB)
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