Impurity-induced and Second Order Raman Spectra of NaCl Crystals Doped with Different Ag+ Concentrations

Raman spectra of NaCl crystals doped with Ag+ ions up to 3.5 mol% have been measured in 4 scattering geometries. In the impurity induced part of the Eg- and F2g-spectra the strongest peaks are located at 85 and 171 cm-1. Their intensities increase proportional to the silver concentration. The second order Raman spectrum on the other hand appears to be independent of the Ag+ content. The spectra are fully explained by theory and by the assumption of Ag+ pairs

Current status of French research on the biological effects of heavy ions in cosmic radiation as observed in high-altitude balloons

On casual inspection, cosmic rays may not be considered to pose a biological hazard. Nevertheless, the heavy ion component does produce a significant but very local irradiation. This has been confirmed by the hair whitening in black-haired animals. Experiments with black C 57 mice in balloons at 30,000 m altitude show white-haired tufts along the tracks of heavy ions. Histological and radioautographic studies were carried out; the results are reported. Similar investigations on black rabbits gave similar results and confirm those obtained previously with black mice. In the discussion, we report that tissue damage is amplified. This fact is not yet explained, but suggests reconsideration of the calculation of radiation dosage. The ionization distribution induced by heavy ions is analyzed. We point out that along their tracks the dosage is very important; therefore it is necessary to investigate their biological action, particle by particle, according to their energy and their charge.