Improving protocols for radiation dosimetry using the alanine/EPR method

Name: Bernard A. Goodman

Organization : Guangxi University. College of Physical Science and Engineering

Email : bernard_a_goodman@yahoo.com

Name: Niramon Worasith

Organization : Rajamangala University of Technology Krungthep. Department of Chemistry

Name: Sumalee Ninlaphruk

Organization : Office of Atoms for Peace

Name: Wen Deng

Organization : Guangxi University. College of Physical Science and Engineering

LCSH: Electron paramagnetic resonance spectroscopy

LCSH: Alanine

Abstract: Exposure of alanine to γ-radiation results in a reductive deammination reaction to form the radical CH3C•HCOO-, which can be detected and quantified by electron paramagnetic resonance (EPR) spectroscopy. For many years this method has been used as a secondary standard for radiation dosimetry measurements. We now describe the development of improved EPR measurement protocols for the use of alanine in radiation dosimetry, and present different acquisition parameters for high (1–100 kGy) and low-moderate (<10 kGy) dose levels. At high radiation doses, microwave power saturation and spectral linewidths are both dose dependent, and result in non-linear calibration curves. This analytical problem is minimized if non-saturating conditions are used for optimizing the spectral acquisition parameters. For low doses, there is no problem of saturation or linewidth variability between samples, and reliable results can be obtained by working with high values of the modulation amplitude (1 mT compared to the usual 0.2 mT) and partially saturating microwave power (5 mW compared to 0.35 mW for non-saturation on our spectrometers). Such modifications to the measurement protocol result in an order of magnitude improvement in sensitivity compared to protocols in current use.

King Mongkut's University of Technology North Bangkok. Central Library

Address: BANGKOK

Email: library@kmutnb.ac.th

Created: 2016

Modified: 2562-10-11

Issued: 2019-10-11

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BibliograpyCitation : In Chemical Society of Thailand under the Patronage of Professor Dr. HRH Princess Chulabhorn and Chulalongkorn University Faculty of science. Pure and Applied Chemistry International Conference (PACCON 2016) (pp.121-126). Bangkok : Chemical Society of Thailand under the Patronage of Professor Dr. HRH Princess Chulabhorn

eng

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