Calibration of TLD-100 powder by energies of 60Co, 137Cs, 192Ir and RX of 250, 50 kVp in a dose absorbed in water with aims to control the dosimetric quality by high dosage rate brachytherapy

To help solve the traceability and quality control dosimetric problems for the users of Ir-192 Sources in the Mexican Republic, the Secondary Standard Dosimetric Laboratory at ININ to calibrated a batch of powder TLD-100 (LiF:Mg,Ti) in terms of absorbed dose to water D,, for the following radiation sources: (CO)-C-60, Cs-137 and RX 250 and 50 kVp. Later on, the calibration is interpolated to obtain file 192 In The calibration radiation field is carried out with the following protocols: For the Co-60, OIEA TRS 399 protocol employing a secondary standard Farmer chamber PTW N30013, calibrated on D-w at the NRC (Canada). For Cs-137 the AAPM TG 43 protocol is used, in terms of air kerma strength S-k determined by the air kerma K-a measured with a secondary standard chamber type thimble NE2611 traceable to the NIST (USA). For Rays X 250 and 50 kVp, the protocol AAPM TG 61 using a tertiary standard Farmer chamber PTW 30001, with traceability to the LCIE (France) on air kerma K-a. The calibration curves are built for the TLD response R-TLD vs D-w, they are fitted by means of a least squares fit technique with a second degree polynomial that corrects the supralinearity response. The Curves are validated by the lack of fit test, and the Anderson Darling normality test. Later on, the sensibility factors are interpolated for the Sources of Ir-192: MicroSelectron and VariSource. Two capsules are sent to two hospitals to verify a nominal D-w = 2 Gy, in the first one an underestimate of the D-w is obtained, and in other one ail overestimation is presented. Finally, the expanded uncertainty associated to D-W and the F-s are calculated.