Measurement of the thermoluminescent response (supralinearity and efficiency) of LiF : Mg, Ti exposed to 0.7 MeV protons
Por:
Gamboa-DeBuen I., Ruiz C., Oliver A., Löpez K., Brandan M.E.
Publicada:
1 ene 1998
Resumen:
The irradiation of LiF : Mg,Ti (TLD-100) chips by a defocused 0.7 MeV proton beam from an electrostatic accelerator has been achieved using radiochromic dye film to evaluate the beam transversal intensity distribution. The dose response has been measured at fluences between 2.4 × 108 and 5.7 × 1011 p/cm2 and peaks 3 9 show linear-supralinear-sublinear response. The efficiency, relative to 60Co ?-rays, measured for the total thermoluminescent (TL) signal and peaks 5 and 7, equals 0.33, 0.22 and 1.4, respectively. The comparison of these and other low-energy data for peak 5 with Track Structure Theory (TST) efficiency calculations indicate that the latter must take into account the stopping of the incident ions in the dosimeter to achieve a reasonable agreement with the observations. In general, neither TST, nor Modified Track Structure Theory (MTST) are able to simultaneously predict the response to 5.3 MeV a-particles and 0.7 MeV protons for all the studied glow curve peaks. Track Interaction Model (TIM) and Unified Track/Defect Interaction Model. (UNIM) calculations of the supralinearity function f(D) of peaks 5 to 8 for 5.3 MeV a-particles and peaks 5 to 9 for 0.7 MeV protons, qualitatively describe the general trends measured in this work; only the UNIM agrees quantitatively with the data in both systems. © 1998 Elsevier Science B.V.
Filiaciones:
Gamboa-DeBuen I.:
Instituto de Ciencias Nucleares, Univ. Nac. Autónoma de Mexico, A. Postal 70-543, México 04510 DF, Mexico
Ruiz C.:
Instituto de Física, Univ. Nac. Autónoma de Mexico, A. Postal 20-364, México 01000 DF, Mexico
Oliver A.:
Instituto de Física, Univ. Nac. Autónoma de Mexico, A. Postal 20-364, México 01000 DF, Mexico
Löpez K.:
Instituto de Física, Univ. Nac. Autónoma de Mexico, A. Postal 20-364, México 01000 DF, Mexico
Brandan M.E.:
Instituto de Física, Univ. Nac. Autónoma de Mexico, A. Postal 20-364, México 01000 DF, Mexico
|