Abstract
Radiation dosimetry for medical and industrial purposes has increasingly evolved over the last few decades with the introduction of various new detectors. Depending on the properties exhibited for radiation dosimetry, some detectors present their applications in a specific area. From a physics point of view, an ideal dosimeter should be able to measure absorbed dose. In this work, synthetic materials based on polybutadiene rubbers (PBR) were proposed as a new class of radiation detectors. The influence of radiation dose on their properties has been investigated for application in radiation dosimetry. The rubber samples were exposed to absorbed doses from 10 Gy up to 250 Gy, using a 60 Co Gamma Cell-220 system. Their responses were carried out with a Fourier Transform Infrared (FTIR) Spectrometer to investigate the presence of absorbance peaks. The results suggested the existence of a relationship between the absorbed doses and the absorbance peaks associated with stretching (1300-1200 cm -1 ), deformation (1450-1340 cm -1 ) and vibration (1500-1400 cm -1 ) processes in the material.
Highlights
In the recent years radiation processing of polymers has been used to modify the molecular structure of the components as an alternative to the more traditional chemical methods, i.e., gamma radiation has been used to induce vulcanization [1,2]
For each wave number of 1020, 1239, 1307, 1404, 1433 and 1448 cm-1 the following sensibilities values were obtained: 0.2250; 0.2442; 0.3038; 0.3111, 0.3510 and 0.3528 Gy-1 respectively (the sensibility is defined as ratio between absorbance (An-A0) by absorbed dose for each wave numbers)
Absorbance of polybutadiene rubber versus absorbed dose of gamma radiation; these results are associated with stretching, deformation and vibration caused by irradiation in polybutadiene samples
Summary
In the recent years radiation processing of polymers has been used to modify the molecular structure of the components as an alternative to the more traditional chemical methods, i.e., gamma radiation has been used to induce vulcanization [1,2]. The polymerization alters a number of chemical and physical properties of the polymer network. Alteration in the chemical properties by radiation is strictly related to generation of free radicals that are formed by dissociation of the excited states or by ion molecular reactions [3]. The irradiation process results in change in both molecular structure and macroscopic properties of the polymer. Physical-chemical crosslinking density affects the physical and chemical properties of irradiated polymer. For medical applications the measurement of the absorbed dose delivered by ionizing radiation in polymers is an exciting scientific field of research, so-called Dosimetry. The response of the irradiated samples was carried out with a Fourier Transform Infrared Spectroscopy-FTIR system to investigate the presence of absorbance peaks and their correlation with absorbed dose
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call