We retrospectively evaluated the risk of second malignancies among 832 patients with inner or central breast cancer treated with conventional external beam schedule (CRT group), or neutron brachytherapy using Californium-252 (²⁵²Cf) sources and hypofractionated external beam radiotherapy (HRTC group), between 1987 and 1996 at the Institute of Oncology, Vilnius University. Patients were observed...

related to the relatively small number of total ions utilized for determining the mass spectra. CONCLUSION It would be a significant advance if the mass resolution of 1500 obtained with inorganic specimens could be retained with nonvolatile and thermally labile organic specimens as well as obtaining the structurally significant fragment ion signals. This advance will require more detailed studi...

Hydrocarbon deposits, often found in oil or polymer industries, are very difficult to detect by the usual inspection techniques of gamma radiography or x-ray radiography methods. The density and atomic number of pipe walls are much higher than that of the scale, therefore, most of the attenuation of gamma rays or x-rays, takes place in the iron, and only a negligible fraction in the scale. This...