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AN ADVANCE IN EPR DOSIMETRY WITH NAILS.

S Sholom1, S W S McKeever1

  • 1Radiation Dosimetry Laboratory, Department of Physics, Oklahoma State University, Stillwater, OK, USA.

Radiation Protection Dosimetry
|February 27, 2019
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Summary
This summary is machine-generated.

Olive oil effectively preserves radiation-induced electron paramagnetic resonance (EPR) signals in nails for up to six days. This storage method aids in accurate radiation dose reconstruction using EPR spectroscopy.

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Radiation Physics

Background:

  • Electron paramagnetic resonance (EPR) spectroscopy is sensitive to radiation-induced signals (RIS) in materials.
  • Signal decay during storage between sample collection and measurement can compromise EPR accuracy.
  • Optimizing storage conditions is crucial for reliable EPR dosimetry.

Purpose of the Study:

  • To evaluate olive oil as a storage medium for nails to minimize the decay of radiation-induced EPR signals (RIS).
  • To investigate the behavior of RIS, mechanically induced signals (MIS), and background signals (BG) when nails are stored in olive oil.
  • To assess the feasibility of radiation dose reconstruction using EPR after storage in olive oil.

Main Methods:

  • Nails were stored in olive oil between harvesting and EPR measurements.
  • The decay and stability of RIS, MIS, and BG signals were monitored over time.
  • Dose recovery tests were performed to evaluate the accuracy of radiation dose reconstruction.

Main Results:

  • Olive oil storage showed minimal decay of RIS, with a slight initial increase followed by stability for at least 6 days.
  • The behavior of MIS and BG signals in olive oil was comparable to storage in a vacuum.
  • Radiation doses around 2 Gy could be reconstructed with approximately ±20% accuracy.

Conclusions:

  • Olive oil is a suitable and effective medium for short-term storage of nails prior to EPR measurements.
  • This method helps preserve the integrity of radiation-induced EPR signals, improving dosimetry accuracy.
  • The findings support the use of olive oil for sample preservation in EPR-based radiation dosimetry.