This document, SP250-99 (2022), NIST Measurement Services: Diffuse Visual Transmission Density, describes the instrument used to measure diffuse visual transmission density of both x-ray and photographic film step tablets. These step tablets replace former Standard Reference Material (SRM) offerings SRM1001 and SRM1008. The instrument is fully automated and is designed and characterized to comply with the international standards for measuring transmission density using the diffuse influx mode. Transmission densities as great as four can be measured with an expanded uncertainty (k = 2) of 0.006.
Document Citations
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Chicago
National Institute of Standards and Technology (NIST), Commerce Department. "Diffuse Visual Transmission Density". Government. Commerce Department, August 17, 2022. https://www.govinfo.gov/app/details/GOVPUB-C13-5847f49dd3ecf39fa39c5ba7eb67104b
APA
National Institute of Standards and Technology (NIST), Commerce Department. (2022, August 17). Diffuse Visual Transmission Density. [Government]. Commerce Department. https://www.govinfo.gov/app/details/GOVPUB-C13-5847f49dd3ecf39fa39c5ba7eb67104b
MLA
National Institute of Standards and Technology (NIST), Commerce Department. Diffuse Visual Transmission Density. Commerce Department, (17 Aug 2022), https://www.govinfo.gov/app/details/GOVPUB-C13-5847f49dd3ecf39fa39c5ba7eb67104b
Bluebook
National Institute of Standards and Technology (NIST), Commerce Department, Diffuse Visual Transmission Density, GovInfo, (August 17, 2022), https://www.govinfo.gov/app/details/GOVPUB-C13-5847f49dd3ecf39fa39c5ba7eb67104b
