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| Titel: |
RADIATION-CHEMICAL FORMATION OF HCL IN POLY(VINYL BUTYRAL) FILMS CONTAINING CHLORAL HYDRATE FOR USE IN RADIATION DOSIMETRY |
| Auteur: |
Abdel-Fattah, A. A. Hegazy, El-Sayed A. El-Din, H. Ezz |
| Verschenen in: |
International journal of polymeric materials |
| Paginering: | Jaargang 51 (2002) nr. 9 pagina's 851-874 |
| Jaar: |
2002-09 |
| Inhoud: |
A new method for calculation of concentration of radiation-formed HCl in poly(vinyl butyral) (PVB) films containing chloral hydrate [CCl 3 CH(OH) 2 , 2,2,2-trichloroethane-1,1-diol] and acid-sensitive dye (thymol blue, TB), was developed. These plastic films undergo color change from yellow (the alkaline form of TB) to red (the acidic form of TB), indicating acid formation. The concentration of radiation-formed HCl in the films containing various concentrations of chloral hydrate was calculated at different doses. The kinetics of the acid-formation reaction is discussed, indicating a 0.35-order reaction with respect to chloral hydrate concentration. These films can be used as labels and dosimeters for some applications of food irradiation and wastewater treatment where the maxima of the useful dose ranges are between 2 and 4 kGy depending on chloral hydrate concentration in the film. Although, the response of these films depends on temperature during irradiation, it has negligible humidity effects in the range of relative humidity from 0 to 60% as well as good post-irradiation stability when stored in the dark at room temperature. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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