TY - JOUR
T1 - Study of combinations of TL/OSL single dosimeters for mixed high/low ionization density radiation fields
AU - Oster, L.
AU - Druzhyna, S.
AU - Orion, I.
AU - Horowitz, Y. S.
N1 - Funding Information:
This research was supported by the Israel Science Foundation (grant No. 8/09 ) and Internal Funding Program of the Sami Shamoon College of Engineering (SCE).
PY - 2013/3/1
Y1 - 2013/3/1
N2 - In this paper we discuss and compare the potential application of combined OSL/TL measurements using 6LiF:Mg,Ti (TLD-600 is enriched of isotope 6Li which has a high cross-section for the reaction with slow neutrons) or 7LiF:Mg,Ti (TLD-700 is enriched of 7Li isotope) and TLD-100 (natural isotopic composition) detectors. The OSL/TL duel readout of LiF:Mg,Ti as an ionization density discriminator avoids some of the difficulties inherent to the various types of discrimination mixed-field passive dosimeters, and in addition has several advantages. The preferential excitation of OSL compared to TL following high ionization density (HID) alpha irradiation, naturally explained via the identification of OSL with the "two-hit" F2 or F3 center, whereas the major component of composite TL glow peak 5 is believed to arise from a "one-hit" complex defect. This evidence allows near-total discrimination between HID radiation and low-ionization density (LID) radiation. Beta and alpha particle irradiations were carried out with 90Sr/ 90Y (∼500 keV average energy) and 241Am sources (4.7 MeV) respectively and neutron irradiations were carried out at the PTB (Germany) (En = 5 MeV) and RARAF (Columbia University, USA) (En = 6 MeV) accelerator facilities. The highest values of the FOM obtained was ∼30 for neutron/gamma discrimination and ∼110 for alpha/gamma discrimination using OSL/TL - peak 5 measurements in TLD-700.
AB - In this paper we discuss and compare the potential application of combined OSL/TL measurements using 6LiF:Mg,Ti (TLD-600 is enriched of isotope 6Li which has a high cross-section for the reaction with slow neutrons) or 7LiF:Mg,Ti (TLD-700 is enriched of 7Li isotope) and TLD-100 (natural isotopic composition) detectors. The OSL/TL duel readout of LiF:Mg,Ti as an ionization density discriminator avoids some of the difficulties inherent to the various types of discrimination mixed-field passive dosimeters, and in addition has several advantages. The preferential excitation of OSL compared to TL following high ionization density (HID) alpha irradiation, naturally explained via the identification of OSL with the "two-hit" F2 or F3 center, whereas the major component of composite TL glow peak 5 is believed to arise from a "one-hit" complex defect. This evidence allows near-total discrimination between HID radiation and low-ionization density (LID) radiation. Beta and alpha particle irradiations were carried out with 90Sr/ 90Y (∼500 keV average energy) and 241Am sources (4.7 MeV) respectively and neutron irradiations were carried out at the PTB (Germany) (En = 5 MeV) and RARAF (Columbia University, USA) (En = 6 MeV) accelerator facilities. The highest values of the FOM obtained was ∼30 for neutron/gamma discrimination and ∼110 for alpha/gamma discrimination using OSL/TL - peak 5 measurements in TLD-700.
KW - Discrimination dosimetry
KW - LiF:Mg,Ti
KW - Neutron and alpha irradiation
KW - Optically stimulated luminescence
KW - Thermoluminescence
UR - http://www.scopus.com/inward/record.url?scp=84884817404&partnerID=8YFLogxK
U2 - 10.1016/j.radmeas.2012.12.023
DO - 10.1016/j.radmeas.2012.12.023
M3 - Article
AN - SCOPUS:84884817404
SN - 1350-4487
VL - 56
SP - 320
EP - 323
JO - Radiation Measurements
JF - Radiation Measurements
ER -