Confocal fluorescent imaging of tracks from heavy charged particles utilising new Al2O3:C,Mg crystals

Radiation Protection Dosimetry
Mark S AkselrodGleb M Akselrod

Abstract

A completely optical, non-destructive imaging of tracks in a fluorescent crystal provides a new way to detect and to assess doses from heavy charged particles and neutrons. The technique combines confocal fluorescent microscopy with a new radiation-sensitive, luminescent material based on aluminium oxide single crystals doped with carbon, magnesium and having aggregate oxygen vacancy defects (Al2O3:C,Mg). Radiation-induced colour centres in the new material have an absorption band at 620 nm and produce fluorescence at 750 nm with a high quantum yield and a short, 75 +/- 5 ns, fluorescence lifetime. Three-dimensional spatial distribution of fluorescent intensity allows one to obtain depth-dose distributions and to discriminate between high- and low-linear energy transfer radiations. Images of single tracks produced by different types of radiation have been obtained. Irradiations with a calibrated 241Am alpha source showed high efficiency for track detection. Thermal neutrons were detected using a nuclear reaction with a 6LiF radiator and production of alpha particles and tritium ions. Fast neutrons were detected using recoil protons produced in a polyethylene radiator installed in front of the crystalline detector. Three-dimensi...Continue Reading

References

Jun 1, 1981·Health Physics·E V BentonR V Wheeler
Apr 12, 2006·Radiation Protection Dosimetry·Mark S Akselrod, Anna E Akselrod

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Citations

May 2, 2008·The Review of Scientific Instruments·S C McDuffeeR D Petrasso
Feb 3, 2018·Journal of Microscopy·J J M KouwenbergA J J Bos
Oct 17, 2017·Radiation Protection Dosimetry·E G YukiharaK Meier
Apr 12, 2006·Radiation Protection Dosimetry·Mark S Akselrod, Anna E Akselrod
Jun 9, 2018·Radiation Oncology·J J M KouwenbergA J J Bos

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