Effects of water treatment and sample granularity on radiation sensitivity and stability of EPR signals in X-ray irradiated bone samples

The article describes effects of sample conditions during its irradiation and electron paramagnetic resonance (EPR) measurements on the background (BG) and dosimetric EPR signals in bone. Intensity of the BG signal increased up to two to three times after crushing of bone to sub-millimetre grains. I...

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Bibliographic Details
Published in:Radiation protection dosimetry 2014-06, Vol.159 (1-4), p.141-148
Main Authors: Ciesielski, Bartlomiej, Krefft, Karolina, Penkowski, Michal, Kaminska, Joanna, Drogoszewska, Barbara
Format: Article
Language:English
Subjects:
Adult
Bone and Bones - chemistry
Bone and Bones - radiation effects
Durapatite - chemistry
Durapatite - radiation effects
Electron Spin Resonance Spectroscopy - methods
Humans
Male
Radiation Dosage
Radiation Tolerance
Radiometry - methods
Water - chemistry
X-Rays
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Summary:The article describes effects of sample conditions during its irradiation and electron paramagnetic resonance (EPR) measurements on the background (BG) and dosimetric EPR signals in bone. Intensity of the BG signal increased up to two to three times after crushing of bone to sub-millimetre grains. Immersion of samples in water caused about 50 % drop in intensity of the BG component followed by its regrowth in 1-2 months. Irradiation of bone samples produced an axial dosimetric EPR signal (radiation-induced signal) attributed to hydroxyapatite component of bone. This signal was stable and was not affected by water. In samples irradiated in dry conditions, EPR signal similar to the native BG was also generated by radiation. In samples irradiated in wet conditions, this BG-like component was initially much smaller than in bone irradiated as dry, but increased in time, reaching similar levels as in dry-irradiated samples. It is concluded that accuracy of EPR dosimetry in bones can be improved, if calibration of the samples is done by their irradiations in wet conditions.
ISSN:0144-8420
1742-3406
DOI:10.1093/rpd/ncu121