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1.
Radiat Prot Dosimetry ; 120(1-4): 95-9, 2006.
Article in English | MEDLINE | ID: mdl-16644958

ABSTRACT

A thermoluminescence dosimetry (TLD) system was characterised at SSDL-ININ to verify the air-kerma strength (S(K)) and dose-to-water (D(W)) values for (137)Cs sources used in low dose rate (LDR) brachytherapy treatments at the Hospital General de Mexico (HGM). It consists of a Harshaw 3500 reader and a set of TLD-100 powder capsules. The samples of TLD-100 powder were calibrated in terms of D(W) vs. nC or nC mg(-1), and their dose response curves were corrected for supralinearity. The D(W) was calculated using the AAPM TG-43 formalism using S(K) for a CDCSM4 (137)Cs reference source. The S(K) value was obtained by using a NE 2611 chamber, and with two well chambers. The angular anisotropy factor was measured with the NE 2611 chamber for this source. The HGM irradiated TLD-100 powder capsules to a reference dose D(W) of 2 Gy with their (137)Cs sources. The percent deviations between the imparted and reference doses were 1.2% < or = Delta < or = 6.5%, which are consistent with the combined uncertainties: 5.6% < or = u(c) < or = 9.8% for D(W).


Subject(s)
Brachytherapy/standards , Cesium Radioisotopes/analysis , Cesium Radioisotopes/therapeutic use , Thermoluminescent Dosimetry/methods , Thermoluminescent Dosimetry/standards , Water , Body Burden , Brachytherapy/methods , Mexico , Radiotherapy Dosage , Reference Values , Relative Biological Effectiveness
2.
Radiat Prot Dosimetry ; 101(1-4): 449-51, 2002.
Article in English | MEDLINE | ID: mdl-12382788

ABSTRACT

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.


Subject(s)
Alanine , Cobalt Radioisotopes/pharmacokinetics , Film Dosimetry/methods , Coloring Agents , Dose-Response Relationship, Radiation , Electron Spin Resonance Spectroscopy/methods , Gamma Rays , Humans , Water
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