A L MELÉNDEZ-LÓPEZ1,2, J CRUZ-CASTAÑEDA1,2, A PAREDESARRIAGA1,3,
A NEGRÓN-MENDOZA1*AND S RAMOS-BERNAL1
1Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, UNAM
2 Programa de Maestría y Doctorado en Ciencias Químicas, Universidad Nacional Autónoma de México, UNAM
3 Facultad de Ciencias, Universidad Nacional Autónoma de México, UNAM
*Email: negrón@nucleares.unam.mx
Abstract The experimental response of the dosimeter as a function of the irradiation temperature plays an important role, and this effect has consequences in the practical applications of dosimetry. In this work, L-glutamic acid (2-aminopentanedioic acid) is proposed to be a good response, easy to handle, and a cheap gamma dosimeter. For this purpose, polycrystalline samples were irradiated with gamma rays at 77, 195, and 295 K and doses in the kiloGray range (43–230 kGy). The potential use of the glutamic acid system as a chemical dosimeter is based on the formation of stable free radicals when the amino acid is exposed to ionizing radiation. The observed species in these experiments were attributed to deamination and decarboxylation reactions that were studied using electron spin resonance (ESR). The results indicate that the analysis generates a linear response as the irradiation dose increases in a reliable range for industrial and research purposes at three different temperatures.
DOI: https://doi.org/10.15415/jnp.2017.51017
LINK: http://dspace.chitkara.edu.in/jspui/bitstream/1/877/1/51017_JNP_MELENDEZ%20-%20NEGRON.pdf
1Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, UNAM
2 Programa de Maestría y Doctorado en Ciencias Químicas, Universidad Nacional Autónoma de México, UNAM
3 Facultad de Ciencias, Universidad Nacional Autónoma de México, UNAM
*Email: negrón@nucleares.unam.mx
Abstract The experimental response of the dosimeter as a function of the irradiation temperature plays an important role, and this effect has consequences in the practical applications of dosimetry. In this work, L-glutamic acid (2-aminopentanedioic acid) is proposed to be a good response, easy to handle, and a cheap gamma dosimeter. For this purpose, polycrystalline samples were irradiated with gamma rays at 77, 195, and 295 K and doses in the kiloGray range (43–230 kGy). The potential use of the glutamic acid system as a chemical dosimeter is based on the formation of stable free radicals when the amino acid is exposed to ionizing radiation. The observed species in these experiments were attributed to deamination and decarboxylation reactions that were studied using electron spin resonance (ESR). The results indicate that the analysis generates a linear response as the irradiation dose increases in a reliable range for industrial and research purposes at three different temperatures.
DOI: https://doi.org/10.15415/jnp.2017.51017
LINK: http://dspace.chitkara.edu.in/jspui/bitstream/1/877/1/51017_JNP_MELENDEZ%20-%20NEGRON.pdf
