Enhancement in dose sensitivity of polymer gel dosimeters composed of radiation-crosslinked gel matrix and less toxic monomers

Hiroki, Akihiro; Yamashita, Shinichi*; Taguchi, Mitsumasa

Journal of Physics; Conference Series, 573(1), p.012028_1 - 012028_4, 2015/01

BB2014-0610.pdf:0.75MB

https://doi.org/10.1088/1742-6596/573/1/012028

Polymer gel dosimeters based on radiation-crosslinked hydroxypropyl cellulose gel were prepared, which comprised 2-hydroxyethyl methacrylate (HEMA) and polyethylene glycol dimethacrylate (9G) as less toxic monomers and tetrakis (hydroxymethyl) phosphoniumu chloride (THPC) as an antioxidant. The dosimeters exposed to Co -rays became cloudy at only 1 Gy. The irradiated dosimeters were optically analyzed by using a UV-vis spectrophotometer to evaluate dose response. Absorbance of the dosimeters linearly increased in the dose range from 0 to 10 Gy. The dose sensitivity increased with increasing 9G concentration. The dosimeter with 2 wt% HEMA, 3 wt% 9G, and 0.16 wt% THPC exhibited about 0.04 Abs Gy of the dose sensitivity. The dose sensitivity of the dosimeters was also enhanced by increment in THPC, reached about 0.06 Abs Gy at 0.40 wt% THPC.

Utilization of carbohydrates by radiation processing

Kume, Tamikazu; Nagasawa, Naotsugu*; Yoshii, Fumio

Radiation Physics and Chemistry, 63(3-6), p.625 - 627, 2002/03

https://doi.org/10.1016/S0969-806X(01)00558-8

no abstracts in English

Induction of biological activity for plant by irradiated polysaccharides

Kume, Tamikazu

Hoshasen To Sangyo, (90), p.41 - 45, 2001/06

http://ci.nii.ac.jp/naid/40004433203

no abstracts in English

Growth-promotion of plants with depolymeriged alginates by irradiation

Hien, N. Q.*; Nagasawa, Naotsugu*; Tham, L. X.*; Yoshii, Fumio; Dang, V. H.*; Mitomo, Hiroshi*; Makuuchi, Keizo; Kume, Tamikazu

Radiation Physics and Chemistry, 59(1), p.97 - 101, 2000/07

https://doi.org/10.1016/S0969-806X(99)00522-8

no abstracts in English

Proceedings of the Takasaki Workshop on Bilateral Cooperations; Radiation Processing of natural Polymers; November 1 and 2, 1999, JAERI, Takasaki, Japan

Functional Materials Laboratory I

JAERI-Conf 2000-003, p.174 - 0, 2000/03

JAERI-Conf-2000-003.pdf:26.6MB

no abstracts in English

Radiation degradation and radiation polymerization

Makuuchi, Keizo

Porima Daijesuto, 51(10), p.81 - 100, 1999/10

http://ci.nii.ac.jp/naid/40004182276

no abstracts in English

Radiation degradation of various polysaccharides and their biological activity

Nagasawa, Naotsugu*; Mitomo, Hiroshi*; Yoshii, Fumio; Makuuchi, Keizo; Kume, Tamikazu

Shokuhin Shosha, 34(1-2), p.37 - 42, 1999/00

no abstracts in English

Employment of the porous particles for preparation of the capsules containing aspirin and drug release property

Hosoi, Fumio; *; ; *

Kobunshi Rombunshu, 42(6), p.415 - 422, 1985/00

https://doi.org/10.1295/koron.42.415

no abstracts in English

Dose response of polymer gel dosimeter based on hydroxypropyl cellulose hydrogel; Toward the application on heavy ion therapy

Hiroki, Akihiro; Yamashita, Shinichi*; Kimura, Atsushi; Nagasawa, Naotsugu; Taguchi, Mitsumasa

no journal, , 

The polymer gel dosimeters consisting of 2-hydroxyethyl methacrylate, nonaethylene glycol dimethacrylate, and tetrakis (hydroxymethyl) phosphoniumu chloride with radiation-crosslinked hydroxypropyl cellulose gel were irradiated with 290 MeV/u C ions at HIMAC. Absorbance of the irradiated dosimeters at 660 nm increased with an increase in the dose up to 10 Gy. The dose response of the dosimeter irradiated with C ions was about 0.007 Abs. Gy, which decreased in about one-tenth of the -irradiated sample. RGB value of the image obtained by using a flat-bed image scanner also increased with increasing dose. Distribution of the dose estimated from RGB value of the scanned image was almost agreement with that of a general radiochromic film for the radiotherapy.