The effect of high-linear energy transfer ions on the electron paramagnetic resonance signal induced in alanine.

Microcrystalline samples of L-alanine irradiated with energetic high-LET cobalt and iron ions had different EPR spectra compared to alanine samples irradiated with low-LET photons. The differences in the shapes of the EPR spectra and their dependence on the microwave power are related to the differences in the microwave power saturation of the radicals induced by the various types of ionizing radiation. The changes in the shape of the EPR spectra, which were caused by increasing microwave power, were more pronounced in samples irradiated with low-LET radiation than with high-LET particles.

A response of L-alpha-alanine and standard bone powder on 3.4 MeV/amu 59Co ion beams.

Dosimetric response of microcrystaline L-alpha-alanine and standard bovine bone powder on 3.4 MeV/amu 59Co ions (LET approximately 5500 eV/nm) was investigated. The long-lived paramagnetic centers created by ion beams were measured after 51 and 420 days.

On the "oxygen in heavy-ion tracks" hypothesis.

Two well-known chemical systems, the Fricke (system I) and the Fricke + ethanol (system II), were irradiated with intermediate-energy 12C and 40Ca ion beams. A vertical beam allowed us to study radiation phenomena in the bulk of a stirred solution and in the motionless surface layer in contact with air. The G value of the formation of Fe3+ in system II compared to system I allowed us to distinguish between oxygenated and hypoxic conditions in the reaction zone, i.

Bone powder exposed to the action of 12C and 25Mg ion beams as investigated by electron paramagnetic resonance spectroscopy.

Bovine compact bone powder was irradiated with alpha-particles of 241Am, 12C6+ and 35Mg12+ ion beams, then examined by the e.p.r.