Determination of Np-237 by radiochemical neutron activation analysis combined with extraction chromatography.

A procedure for determination of 237Np, 238Pu, 239,240Pu and 241Pu in environmental samples is described. Neptunium-237 is determined using radiochemical neutron activation analysis with pre- and post-irradiation chemistry based on solvent extraction and extraction chromatography. 238Pu, 239,240Pu is determined using alpha spectrometry and 241Pu by liquid scintillation spectrometry.

[Segmental and atypical resections in lung cancer].

Segmental or atypical resection was performed in 25 out of 1120 (2.2%) patients operated on for lung cancer. The choice was determined by concomitant pathology and old age.