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In its present form it- is unlikely thSt this type of apparatus could find application (in lead screening programs since it is incapable >of discrinunoting between lead contents of domestic paint films in the 0-6S range. These findings are in marked contrast to the laboratory results for a scries of standard paints and almost certainly result from the non-homogeneity end the variable thickness of paint.films encountered in tbe field.
SUMMARY
The application of x-ray fluoreacanee to the determination of the leed content of peint films was evaluated using a portable isotope fluorescence anal yser. Accurote determinations were achieved in the laboratory using prepared films in which the lead was dispersed through matrices of constant composition in a single layer. The presence of lead could be masked by overlying paint films of low leed content and was almost obscured by an overlying peint film of 77 mg/cm2. The results for domestic peint films
correlated with chemical analyses but the confidence limlta were too widely separated to allow appli cation of thia technique to lead screening programs.
The field results probably reflect non-homogeneity of domestic point films.
Acknowledgements
\
Vs are Indebted to Hr. G.A. Cooper of the Computer Centre, Queen Mary College, University of London, for analysis of sons of the data.
Befercncca
1- Baritrop, D* Postgrad. Med. J. 45f 129 fi969).
2. Chisolm, J.J.Jr. and Harrison. H.E* 18* 9*0 (1956).
Pediatrics
3* Sacha, K.K., Blanksma, L.A., Murray, E.F* and
O'Connall, H.J.
Pediatrics
389 (2970). `
k. Berltrop, D. and Sillala, N.J.P. Childh. 44, 476 (1969).
'Arch. Dis.
5. Barltrop, D.
Arhiv. Hig. Rad. Tolcsikol. 21.
No. 3 (1970). - *
6. Browett, E.V. and Hosa, R.
Analyst. Lond. 90.
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