A L Melendez-Lopez, A Paredes-Arriaga, J Cruz-Castaneda, A Negron-Mendoza, S Ramos-Bernal, M Colin-Garcia and A Heredia
dyes, linearity dose -response, chemical dosimeter, low temperatures
|PUBLISHED DATE||August 6, 2018|
|PUBLISHER||The Author(s) 2018. This article is published with open access at www.chitkara.edu.in/publications.|
The aim of this work is to study the behavior under irradiation of different dyes (green malachite, methyl orange, red cresol, and bromothymol blue) in organic solvents (acetone and methanol) at different gamma doses and different temperatures to propose them as possible dosimeters for lowtemperature applications. For this purpose, organic dissolutions were irradiated with gamma rays in the kiloGray (kGy) range at 77 and 295 K, and the color bleaching of the solutions was followed spectrophotometrically (UV-Vis range). The response curves at different temperatures show the linear range interval from 10 to 40 kGy with correlation coefficients of 0.999 and 0.998 for some systems. This is the main reason to continue carrying out studies that allow the proposal of these systems as chemical dosimeters.
Quantitative study in radiation chemistry requires knowledge of the amount of energy absorbed from the ionizing radiation. Determination of this absorbed energy is carried out by using a dosimeter . Dosimeters can be divided into primary (physical) dosimeters, which directly assess the absorbed dose by measuring a physical change, and secondary (chemical) dosimeters, which are the most used and in which a chemical change is related to the received dose . Some commercial applications require a reliable, lowtemperature dosimeter for use under the conditions of the irradiation process; for example, (1) for food preservation, such as the irradiation of sea products ; (2) radiation processing at low temperature for increasing the efficiency of polymerization reactions for nanoparticles and polymers synthesis ; (3) radiation chemical experiments connected to chemical evolution in early systems . Organic dyes that are usually colored compounds on aqueous aerated acidic or alkaline samples have been investigated and used as potential chemical dosimeters [6-8]. Results of some experimental works have proposed using solutions of certain dyes in organic solvents as dosimetry systems that may be measured using spectrophotometer techniques [9-11]. However, the behavior of these systems at low temperatures has not been studied to be able to propose them as dosimetric systems that work at low temperatures. The aim of the present work is to investigate the response of the change in the absorbance versus absorbed gamma dose in the kiloGray range of 295 and 77 K for some dyes in organic solvents to propose them as chemical dosimeters for low-temperature processes.
|ISSN||Print : 2321-8649, Online : 2321-9289|