Electron Paramagnetic Resonance Dosimeter Research Articles

ESR dosimeters based on metallodiphthalocyanines: Correlation between ESR and spectrophotometric data

Ionizing radiation (IR) induced redox processes in liquid dosimetric systems based on diphthalocyanine metal (DPcM) complexes solutions in organic solvents are accompanied by changes in their visible spectra and magnetic properties which can be measured by electron spin resonance (ESR) method at g ≅ 2 and spectrophotometry (SP) without any special treatment of the samples. The good correlation between ESR and SP data for different systems based on solutions of DPc complexes of Lu, Hf and Zr can be explained by the fact that both methods determine the concentration of DPcM radical forms. The better accuracy of ESR method makes it possible to measure lower doses than using SP procedure.

Radiation accident dosimetry using shells

Ten different types of shell were tested as electron spin resonance dosimeters. In particular, properties such as fading, background spectra, and relative sensitivity were studied. The aim of this study was to evaluate the external dose exposed to the public in the vicinity of the radiation accident. Some shells were found to contain a considerable amount of Mn +2 ions which interfered with the spectral features of interest. The sensitivity of ESR was dependent on the type of the shell and fading of the ESR signal from the irradiated shell which was rarely observed at room temperature. Some shells which were of high sensitivity could be considered as useful materials in developing an emergency dosimeter for the public.