Instrumental neutron activation analysis of air filter samples

This paper reports the capabilities of automated instrumental neutron activation analysis as demonstrated on 40 air filter samples from Cleveland's area. The results indicate the usefulness of the method in the measurement of elemental concentrations in airborne particulates. Through the use of automated gamma-ray spectrometry procedures, magnetic tape recording of spectral data and computerized processing of data, the method becomes very competitive from the standpoint of sensitivity and cost. The capabilities of the technique for air filter analysis may be summarized as follows: a., over 33 elements are measurable in a filter sample; b., the median detection limit for airborne concentration of an element is approximately 4.10-9 grams.meter-3; c., around 26 elements are detectable in a typical cellulose filter sample; d., the method is non-destructive, therefore the sample can be retained for further analysis. (T.G.)