The influence of unstable signals for electron spin resonance dosimetry with synthetic A-type carbonated apatite.
Synthetic A-type carbonated apatite prepared in controlled conditions was irradiated at room temperature with 60Co gamma rays. The ESR spectrum was associated to axial CO2- and orthorhombic CO3- species. Radicals used as dose markers in biological apatites are long-lived paramagnetic species. The stability of the post-irradiation signal of A-type apatite was investigated for almost 2 years. Measurements showed variations in the spectra attributed to unstable CO3- species, which can be eliminated by thermal treatments at 100 degrees C for 24 h. Results indicated the potential use of an A-type carbonated apatite as a dosemeter.
de Oliveira
L M
LM
Instituto de Radioproteção e Dosimetria-IRD/CNEN, Rio de Janeiro, Brasil. liana@ird.gov.br
Rossi
A M
AM
Lopes
R T
RT
Rodrigues
L N
LN
D001031:Apatites / Q000737:chemistry* / Q000528:radiation effects*; D002254:Carbonates; D004574:Electromagnetic Fields; D004578:Electron Spin Resonance Spectroscopy / Q000379:methods; D011874:Radiometry / Q000379:methods; D015203:Reproducibility of Results
D001031:Apatites; D002254:Carbonates