Notes. Precision and accuracy of a .beta. gauge for aerosol mass determinations

摘要: Results of an experimental determination the precision and accuracy a ..beta..-ray attenuation method for measurement aerosol mass are presented. The instrumental short-term experiment was 25 ..mu..g 6.5-cm/sup 2/ deposit collected on approximately 1 mg/cm/sup Teflon filters; longer-term 27 ..mu..g. gravimetric determinations deposits 22 filters weighed to Filter reorientation air density changes that were able adversely affect results discussed. in good agreement with measurements same filter-collected aerosols. Using dichotomous samplers Durham, NC, we 136 samples two size ranges. A regression line calculated implicitly assuming errors both mass. 90% confidence intervals lay within 21 mean fine fraction loadings 536 19 coarse 349 Any bias between ..beta..-gauge found be less than 5%.