Intercomparison of absorbed dose to water measurements for 60Co gamma rays using Fricke, alanine and radiochromic dye film dosimetry.
Measurements of absorbed dose at 5 cm depth in a 30 x 30 x 30 cm3 water phantom have been performed using three independent dosimetric techniques: Fricke, alanine and radiochromic dye film (GafChromic HD-810). The measurements were carried out in the secondary standard dosimetry laboratory at ININ Mexico using a collimated 60Co gamma source with a radiation field of 10 x 10 cm2 at the phantom front surface. The source to phantom distance was set at 100 cm. The reference absorbed dose at 5 cm depth in the water phantom was obtained using a 0.6 cm3 ionisation chamber. The absorbed dose to water for the test dosimetry techniques was around 100 Gy. The deviations of the dose obtained from these dosimetry techniques were within 4%. The reasons for these deviations are discussed.
Villarreal-Barajas
J E
JE
Instituto Nacional de Investigaciones Nucleares, Salazar, Estado de México, Mexico. jevb@nuclear.inin.mx
González-Martínez
P R
PR
Ureña-Nuñez
F
F
Martínez-Ayala
L
L
Tovar-Muñoz
V M
VM
D000409:Alanine; D003037:Cobalt Radioisotopes / Q000493:pharmacokinetics*; D004396:Coloring Agents; D004307:Dose-Response Relationship, Radiation; D004578:Electron Spin Resonance Spectroscopy / Q000379:methods; D005373:Film Dosimetry / Q000379:methods*; D005720:Gamma Rays; D006801:Humans; D014867:Water
D003037:Cobalt Radioisotopes; D004396:Coloring Agents; D014867:Water; D000409:Alanine