cresol red
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Polymers ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1866
Author(s):  
Aris Doyan ◽  
Susilawati Susilawati ◽  
Saiful Prayogi ◽  
Muhammad Roil Bilad ◽  
Muhamad Fatikul Arif ◽  
...  

This study investigated the polymer film composite of polyvinyl alcohol (PVA), trichlorethylene (TCE) and cresol red (CR) dye irradiated with gamma (γ) rays for potential application as radiation dosimetry. The film was prepared via the solvent-casting method with varying concentrations of TCE. Film samples were exposed to radiation from a γ-rays radiation source of 60Cobalt isotope. Color changes before and after γ-rays irradiation were observed, and the optical properties of the polymer films were investigated by spectrophotometry. Results show that increasing the radiation dose physically changed the color of the polymer film, from purple (pH > 8.8) without radiation (0 kGy) to yellow (almost transparent) (2.8 < pH < 7.2) at the highest dose (12 kGy). The concentration of acid formed due to irradiation increased with the increase in irradiation doses and at higher TCE content. The critical doses of PVA-TCE composites decreased linearly with the increase of TCE composition, facilitating an easy calibration process. The dose response at 438 nm increased exponentially with increasing radiation dose, but showed an opposite trend at the 575 nm band. An increase in the TCA concentration indicated a decrease in the absorption edge and an increase in activation energy, but both decreased for all TCE concentrations at higher doses. The energy gap for the direct and the indirect transitions decreased with increasing TCE concentration and γ-rays radiation dose. The results of this study demonstrated the potential application of PVA-TCE-CR polymer film as γ-rays irradiation dosimetry in a useful dose range of 0–12 kGy.


2021 ◽  
Vol 7 (2) ◽  
pp. 87-92
Author(s):  
O. K. Matanmi

Occasional problems with improperly heated soybean meal persist even though methods and rather good evaluation procedures are available. The technique of Olomucki and Bornstein (1960) in volves absorption of cresol red during a shaking process of a specific grind on soybean meal and will evaluate overheated as well as underheated soybean meal. Attempts have been made to determine if the (mg cresol red absorbed per g meal) reported was the lowest safe level. Unheated soybean meal samples averaged 2.55. Genetically uniform day old chicks fed heated soybean meal sample testing 3.3 averaged 61.9 g at one week compared with 68.3g for soybean meal testing 3.6. Poults fed the same meals averaged 129g and 138g respectively at one week. In both tests at two weeks these differences had decreased to only 266 vs 271. Effects on pancreas Weights were not significant except with raw soybean meals. 


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