Elaboración de dosímetros de alanina y sus posibles aplicaciones en riesgos profesionales

Elaboration of alanine dosimeters and their possible applications in professional risks. Objective. To develop dosimeters of alanineand alanine/paraffin in order to meet the growing use of ionizing radiation at the technological level. Materials and methods. Free radicalsproduced by ionizing radiation in alanine are detected by electron spin resonance (ESR); paraffin is used as binder. The methodology ofpreparation includes: elaboration, irradiation, data collection and data analysis for the two types of dosimeters. The ESR spectra studiedcorrespond to alanine dosimeters with masses between 60 and 120 mg and irradiated with doses of 10 and 20 Gy, and alanine/paraffindosimeters with 160 mg and irradiated with different doses in a beam of photons 4 MV. Results. The intensity of the spectra (thecharacteristic five lines) depends on the doses received by the dosimeters and their relationship is linear. With pure alanine and a dose of 10Gy, the minimum amount required was 120 mg; the achieved cylinder compaction was not sufficient to avoid the partial fragmentation ofthe dosimeter. Paraffin has no paramagnetic signal; in the alanine/paraffin dosimeters (cylinders of 13 mm in length and 3.5 mm of diameter,with a ratio 80:20, and good hardness) the response signal ESR-dose was studied in a range between 20 and 120 Gy. Conclusions. Thecylinders of alanine/paraffin manufactured have an appropriate hardness to be handled as dosimeters of ionizing radiation; their reproducibilityand effectiveness in the accumulation of dose is good