1.1 本试验方法包括使用14 MeV中子活化和直接计数技术测量几乎任何基质中的氧浓度。基本上，根据样本大小和可用的14 MeV中子注量率，可以使用相同的系统来确定从10μg/g以下到500 mg/g以上的氧气浓度。 注1: 通过使用更高的中子注量率、更大的样品和更高的计数效率探测器，可以扩大分析范围。 1.2 本试验方法可用于固体或液体样品，前提是其在辐照和计数期间的尺寸、形状和宏观密度符合已知氧含量的标准样品。技术文献中描述了该方法的几种变体。有一本专著全面介绍了使用中子发生器进行活化分析的原理 ( 1. ) . 2. 1.3 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.4 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 具体预防措施见第节 8. . 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 液体或固体样品中氧含量的常规测定是一个相对困难的化学过程。 它速度慢，通常灵敏度有限。14 MeV中子活化和直接计数技术为广泛基质中的氧测定提供了一种快速、高灵敏度、非破坏性的程序。该试验方法独立于氧的化学形式。 5.2 该测试方法可用于金属、煤炭和石油行业的质量和过程控制，以及广泛应用的研究目的。

1.1 This test method covers the measurement of oxygen concentration in almost any matrix by using a 14-MeV neutron activation and direct-counting technique. Essentially, the same system may be used to determine oxygen concentrations ranging from under 10 μg/g to over 500 mg/g, depending on the sample size and available 14-MeV neutron fluence rates. Note 1: The range of analysis may be extended by using higher neutron fluence rates, larger samples, and higher counting efficiency detectors. 1.2 This test method may be used on either solid or liquid samples, provided that they can be made to conform in size, shape, and macroscopic density during irradiation and counting to a standard sample of known oxygen content. Several variants of this method have been described in the technical literature. A monograph is available which provides a comprehensive description of the principles of activation analysis using a neutron generator ( 1 ) . 2 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.4 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 appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Specific precautions are given in Section 8 . 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 The conventional determination of oxygen content in liquid or solid samples is a relatively difficult chemical procedure. It is slow and usually of limited sensitivity. The 14-MeV neutron activation and direct counting technique provides a rapid, highly sensitive, nondestructive procedure for oxygen determination in a wide range of matrices. This test method is independent of the chemical form of the oxygen. 5.2 This test method can be used for quality and process control in the metals, coal, and petroleum industries, and for research purposes in a broad spectrum of applications.