The first phase of this program was a literature study and evaluation of potential measurement techniques and a more precise definition of stack environment. Volumes I and II of this report series contain the results of this study. The second phase was an experimental evaluation of the most promising technique: beta radiation attentuation. Section 2 describes early laboratory tests performed with the sensing head of a Gelman beta radiation instrument. Section 3 describes a sampling facility, designed specifically for the evaluation of the instruments which measure particle mass concentration of stack effluent. Section 4 describes results of the calibration of the sampling facilities in the field experiment station under several normal operating conditions. Section 5 describes tests of two prototype instruments with beta radiation particle mass sensors. The highly encouraging measurements indicate that the beta radiation sensing with filter collection of particles is a strong candidate for the measurement of particle mass concentration in smoke stacks. Section 6 presents candid comments regarding the stat-of-the-art of commercial transmissometers in January 1971.

"PB 202665." "Thermo-Systems." "Prepared under contract no. CPA 70-23 with the Division of Process Control Engineering, Air Pollution Control Office, Environmental Protection Agency." "Program Element No. 1AA 010." "EPA Project Officer: John O. Burckle Control Systems Laboratory National Environmental Research." "Sponsored by the National Environmental Research Center"--Page vi, v. IV "Prepared for Office of Research and Development U.S. Environmental Protection Agency." "July 1972"--Title page, v. III "September 1973." Includes bibliographical references. Sponsored by the National Environmental Research Center Contract Number: CPA 70-23

v. 2 Particulate mass, detail report.