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DEMONSTRATION OF THE POTENTIAL AND DIFFICULTIES OF COMBINED TL AND OSL MEASUREMENTS OF TLD-600 AND TLD-700 FOR THE
L Oster1, I Eliyahu2, Y S Horowitz3
1Sami Shamoon College of Engineering, Bialik St. 56, Beer Sheva 84100, Israel.
Combined optically stimulated luminescence/thermoluminescent (OSL/TL) dosimetry shows promise for neutron-gamma discrimination. This method efficiently distinguishes radiation types using LiF:Mg, Ti detectors, offering a dual readout capability on the same sample.
Area of Science:
- Radiation detection and measurement
- Dosimetry
- Nuclear physics
Background:
- Optically stimulated luminescence (OSL) and thermoluminescence (TL) are established dosimetry techniques.
- Neutron and gamma radiation require distinct detection methods for accurate dose assessment.
- LiF:Mg, Ti (TLD-600 and TLD-700) are commonly used thermoluminescent dosimeters.
Purpose of the Study:
- To evaluate the potential of combined OSL/TL measurements for neutron-gamma discrimination.
- To assess the calibration coefficients for LiF:Mg, Ti dosimeters under mixed radiation fields.
- To determine the effectiveness of OSL/TL in differentiating fast and thermal neutron components from gamma radiation.
Main Methods:
- Calibration of LiF:Mg, Ti (TLD-600 and TLD-700) using a 90Sr/90Y gamma source.
- Irradiation of dosimeters with a 5 MeV median energy fast neutron beam at RARAF.
- Calculation of KERMA to transfer dose levels to 6,7LiF.
- Determination of a figure of merit for fast-neutron/gamma ray discrimination.
Main Results:
- The study demonstrated the potential of combined OSL/TL for neutron-gamma discrimination.
- Gamma/electron calibration coefficients for TLD-600 and TLD-700 were successfully measured.
- A figure of merit of 10.6 was determined for TLD-700 in fast-neutron/gamma ray discrimination.
- A significant thermal neutron component (116 Gy) was unexpectedly detected in TLD-600.
Conclusions:
- Combined OSL/TL measurements offer a viable approach for neutron-gamma discrimination dosimetry.
- The dual readout capability and differential sensitivity of OSL/TL enhance radiation characterization.
- The findings highlight the importance of considering both fast and thermal neutron contributions in mixed radiation fields.
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