DEMONSTRATION OF THE POTENTIAL AND DIFFICULTIES OF COMBINED TL AND OSL MEASUREMENTS OF TLD-600 AND TLD-700 FOR THE DETERMINATION OF THE DOSE COMPONENTS IN COMPLEX NEUTRON-GAMMA RADIATION FIELDS
| Autor: | I. Eliyahu, A Shapiro, G. Reshes, L. Oster, Y.S. Horowitz, G Garty |
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| Rok vydání: | 2020 |
| Předmět: |
Neutrons
Radiation Materials science Radiological and Ultrasound Technology Optically stimulated luminescence Radiochemistry Public Health Environmental and Occupational Health Gamma ray General Medicine Radiation Dosage Neutron temperature Kerma Gamma Rays Strontium Radioisotopes Humans Dosimetry Thermoluminescent Dosimetry Yttrium Radioisotopes Radiology Nuclear Medicine and imaging Neutron Thermoluminescent dosimeter |
| Zdroj: | Radiation Protection Dosimetry. 188:383-388 |
| ISSN: | 1742-3406 0144-8420 |
| Popis: | The results reported herein demonstrate the potential application of combined optically stimulated luminescence/thermoluminescent (OSL/TL) measurements in neutron-gamma discrimination dosimetry. The advantages of OSL/TL are two-fold: (i) The OSL and TL readout can be carried out on the same sample and (ii) the greater efficiency of OSL to high ionization density radiation due to F 2 and F3 excitation. The gamma/electron calibration coefficients for LiF:Mg, Ti (TLD-600 and TLD-700) were measured using a 90Sr/90Y source calibrated at the SARAF-SSDL nuclear facility. The estimation of the neutron calibration coefficients was carried out by irradiation with broad-spectrum beam of fast neutrons with median energy 5 MeV at the Radiological Research Accelerator Facility (RARAF) of Columbia University. Naturally cooled samples of TLD-600 and TLD-700 were dosed to levels of 29.8 Gy neutrons and 6.1 Gy gammas in air and KERMA calculations employed to transfer the levels of dose to6,7LiF. A figure of merit for fast-neutron/gamma ray discrimination was determined at 10.6 for TLD-700 in the current measurements. The use of combined TLD-600/TLD-700 allowed, as well, the determination of a considerable and somewhat unexpected thermal neutron component of 116 Gy in TLD-600. |
| Databáze: | OpenAIRE |
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