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Title: Attachment of radon progeny to cigarette-smoke aerosols

Attachment of radon progeny to cigarette-smoke aerosols The daughter products of radon gas are now recognized as a significant contributor to radiation exposure to the general public. It is also suspected that a synergistic effect exists with the combination cigarette smoking and radon exposure. We have conducted an experimental investigation to determine the physical nature of radon progeny interactions with cigarette smoke aerosols. The size distributions of the aerosols are characterized and attachment rates of radon progeny to cigarette-smoke aerosols are determined. Both the mainstream and sidestream portions of the smoke aerosol are investigated. Unattached radon progeny are very mobile and, in the presence of aerosols, readily attach to the particle surfaces. In this study, an aerosol chamber is used to contain the radon gas, progeny and aerosol mixture while allowing the attachment process to occur. The rate of attachment is dependent on the size distribution, or diffusion coefficient, of the radon progeny as well as the aerosol size distribution. The size distribution of the radon daughter products is monitored using a graded-screen diffusion battery. The diffusion battery also enables separation of the unattached radon progeny from those attached to the aerosol particles. Analysis of the radon decay products is accomplished using alpha spectrometry. The aerosols of more » interest are size fractionated with the aid of a differential mobility analyzer and cascade impactor. The measured attachment rates of progeny to the cigarette smoke are compared to those found in similar experiments using an ambient aerosol. The lowest attachment coefficients observed, {approximately}10{sup {minus}6} cm{sup 3}/s, occurred for the ambient aerosol. The sidestream and mainstream smoke aerosols exhibited higher attachment rates in that order. The results compared favorably with theories describing the coagulation process of aerosols. « less
Authors: ;
Publication Date:
OSTI Identifier:78555
Report Number(s):UCRL-CR--120647
ON: DE95013271; TRN: 95:016396
DOE Contract Number:W-7405-ENG-48
Resource Type:Technical Report
Data Type:
Resource Relation:Other Information: PBD: May 1995
Research Org:Lawrence Livermore National Lab., CA (United States)
Sponsoring Org:California Univ., Berkeley, CA (United States)
Country of Publication:United States
Language:English
Subject: 56 BIOLOGY AND MEDICINE, APPLIED STUDIES; TOBACCO SMOKES; SORPTIVE PROPERTIES; RADIOACTIVE AEROSOLS; RADON 222; RADIATION HAZARDS; DAUGHTER PRODUCTS; RADON; HEALTH HAZARDS; SYNERGISM; EPIDEMIOLOGY; POLONIUM 214; POLONIUM 218