CO2 doped γ-irradiated hydroxyapatite for EPR dosimetry
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Farhood Ziaie
Abstract
Synthetic nano-structure hydroxyapatite samples were doped by carbon in furnace via exposing to CO2 circulating gas in different time of 30, 120, and 360 min under 100°C and 400°C of temperatures. FTIR, TEM and XRD analyses results confirmed the doping of carbonate group to the hydroxyapatite structure. The samples were irradiated in absorbed doses of 2, 5, 10, 20, 50, and 80 kGy using a 60Co γ-ray source and subjected to EPR measurement, subsequently. The EPR signal intensities were constructed as a function of radiation dose, were compared with the results of raw sample and were studied from dosimetric point of view. The obtained results show a considerable increment in EPR signal intensities of the samples which were treated at 400°C. At the doses less than 20 kGy the carbon doped samples show a better EPR respond. This is much better for doses below 5 kGy in comparison to the raw samples and the response is quite linear.
Kurzfassung
Synthetische Nano-Struktur-Proben von Hydroxyapatit wurden mit Kohlenstoff dotiert indem die Probe zirkulierendem CO2 Gas verschieden lange, 30, 120, und 360 min und Temperaturen von 100°C und 400°C ausgesetzt war. FTIR, TEM und XRD Analyseergebnisse bestätigen die Dotierung des Hydroxyapatit mit Kohlenstoff. Die Proben wurden bestrahlt mit Energiedosen von 2, 5, 10, 20, 50 und 80 kGy mit Hilfe einer 60Co Gammaquelle und danach wurden EPR Messungen durchgeführt. Die EPR-Signalintensitäten wurden als Funktion der Strahlendosis dargestellt und mit den Ergebnissen der undotierten Proben verglichen und aus dosimetrischer Sicht untersucht. Die erhaltenen Ergebnisse zeigen einen beträchtlichen Anstieg der EPR-Signalintensitäten der Proben, die bei 400°C behandelt worden waren. Bei Dosen unter 20 kGy zeigen die Kohlenstoff-dotierten Proben ein besseres EPR Ansprechverhalten. Dieses ist viel besser für Dosen unter 5 kGy im Vergleich zu den undotierten Proben und das Ansprechverhalten ist ziemlich linear.
References
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© 2014, Carl Hanser Verlag, München
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Articles in the same Issue
- Contents/Inhalt
- Contents
- Summaries/Kurzfassungen
- Summaries
- Technical Contributions/Fachbeiträge
- Decomposition analysis of the sodium void reactivity of the Korean sodium-cooled fast reactor
- Flow accelerated corrosion study in feeder pipes
- Analysis of the flow instability among channels of the OTSG in the naval craft NPP
- Experimental investigation of the MSFR molten salt reactor concept
- Investigation of neutronic behavior in a CANDU reactor with different (Am, Th, 235U)O2 fuel matrixes
- Atomistic nano-scale 3D simulations about effects of Cr percentage on the molecular dynamics parameters of Fe-9–12% Cr alloys at fusion reactor temperature conditions
- On an analytical evaluation of the flux and dominant eigenvalue problem for the steady state multi-group multi-layer neutron diffusion equation
- A finite volume approach to the problem of heat transfer in axisymmetric annulus geometry with internal heating element using local analytical solution techniques
- CO2 doped γ-irradiated hydroxyapatite for EPR dosimetry
- An investigation of the effect of the upper beryllium reflector on the moderator temperature coefficient of reactivity of miniature neutron source reactors
