NOTICE: Due to a lapse in annual appropriations, most of this website is not being updated. Learn more.

Form submissions will still be accepted but will not receive responses at this time. Sections of this site for programs using non-appropriated funds (such as NVLAP) or those that are excepted from the shutdown (such as CHIPS and NVD) will continue to be updated.

U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

PUBLICATIONS

Diffuse Visual Transmission Density

Published

Author(s)

Clarence Zarobila, Robert E. Vest, Maria E. Nadal

Abstract

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.
Citation
Special Publication (NIST SP) - 250-99
Report Number
250-99
NIST Pub Series
Special Publication (NIST SP)
Pub Type
NIST Pubs

Download Paper

https://doi.org/10.6028/NIST.SP.250-99
Local Download

Keywords

densitometer, diffuse transmission, diffuse influx, standard reference materials, transmission density.
Metrology

Citation

Zarobila, C. , Vest, R. and Nadal, M. (2022), Diffuse Visual Transmission Density, Special Publication (NIST SP), National Institute of Standards and Technology, Gaithersburg, MD, [online], https://doi.org/10.6028/NIST.SP.250-99, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=934647 (Accessed October 10, 2025)

Issues

If you have any questions about this publication or are having problems accessing it, please contact [email protected].

Created August 17, 2022, Updated November 29, 2022
Was this page helpful?