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Journal Articles

Dyed Polyvinyl Chloride films for use as high-dose routine dosimeters in radiation processing

Mai, H. H.*; Duong, N. D.*; Kojima, Takuji

Radiation Physics and Chemistry, 69(5), p.439 - 444, 2004/04

 Times Cited Count:19 Percentile:77.18(Chemistry, Physical)

Characteristics of the polyvinyl chloride films containing 0.11wt% of malachite green oxalate or 6GX-setoglausine with 100$$mu$$m in thickness were studied for use as routine dosimeters in radiation processing. These films show basically color bleaching under $$^{60}$$Co $$gamma$$-ray irradiation in a dose range of 5 to 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 extent the minimum dose limit to 1 kGy covering dosimetric quality assurance in radiation processing of food and healthcare products. The dose responses of both films at irradiation temperatures of 20-35$$^{circ}$$C are constant relative to those at 25$$^{circ}$$C, and the irradiation temperature coefficients for 35-55$$^{circ}$$C were estimated to be (0.43 $$pm$$ 0.01)%/ $$^{circ}$$C. The dosimeter characteristics are stable within 1% at 25$$^{circ}$$C before and 60 days after irradiation.

Journal Articles

Characterization and evaluation studies on some JAERI dosimetry systems

Kojima, Takuji; Sunaga, Hiromi; Tachibana, Hiroyuki; Takizawa, Haruki; Tanaka, Ryuichi

IAEA-TECDOC-156, p.91 - 98, 2000/06

no abstracts in English

Journal Articles

Sterilization and disinfection methods based on the Japanese pharmacopoeia

Kojima, Takuji; Tanaka, Ryuichi

Nihon Yakkyokuho Ni Junkyoshita Mekkinho Oyobi Biseibutsu Satsumetsuho, p.74 - 82, 1997/00

no abstracts in English

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