1.1 这种做法 2. 涵盖用于在射线照相胶片上测量漫反射光密度的透射密度计的校准（参见 注1 ). 1.2 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。 注1: 有关密度计设计和使用的更多信息，建议使用以下文献作为附加背景信息: 国际标准化组织 5–1:2009，ISO 5-2:2009、ISO 5-3:2009和ISO 14807:2001. 1.3 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====== 4.1 本规程提供了一种校准透射密度计的方法，用于测量射线照相胶片上的漫光密度。 根据本规程校准的透射密度计可确保获得准确的射线照片光密度值。

1.1 This practice 2 covers the calibration of transmission densitometers used to perform measurements of diffuse optical density on radiographic films (see Note 1 ). 1.2 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. Note 1: For further information on the design and use of densitometers, the following literature is suggested as additional background information: ISO 5–1:2009, ISO 5–2:2009, ISO 5–3:2009, and ISO 14807:2001. 1.3 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 ====== 4.1 This practice provides a means for calibrating transmission densitometers used for the measurement of diffuse optical density on radiographic films. A transmission densitometer calibrated in accordance with this practice provides the assurance that accurate optical density values of radiographs are obtained.