| Autor: |
Takuji Kojima, Hoang Hoa Mai, Nguyen Dinh Duong |
| Rok vydání: |
2004 |
| Předmět: |
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| Zdroj: |
Radiation Physics and Chemistry. 69:439-444 |
| ISSN: |
0969-806X |
| DOI: |
10.1016/j.radphyschem.2003.08.006 |
| Popis: |
Characteristics of the polyvinyl chloride (PVC) films containing 0.11 wt% of malachite green oxalate or 6GX-setoglausine and about 100 μm in thickness were studied for use as routine dosimeters in radiation processing. These films show basically color bleaching under irradiation with 60 Co γ -rays in a dose range of 5–50 kGy. The sensitivity of the dosimeters and the linearity of dose-response curves are improved by adding 2.5% of chloral hydrate [CCl 3 CH(OH) 2 ] and 0.15% hydroquinone [HOC 6 H 4 OH]. These additions extend the minimum dose limit to 1 kGy covering dosimetry requirements of the quality assurance in radiation processing of food and healthcare products. The dose responses of both dyed PVC films at irradiation temperatures from 20°C to 35°C are constant relative to those at 25°C, and the temperature coefficients for irradiation temperatures from 35°C to 55°C were estimated to be (0.43±0.01)%/°C. The dosimeter characteristics are stable within 1% at 25°C before and 60 days after the end of irradiation. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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Full Text from ScienceDirect