PMMA-dosimeter

Details PMMA-dosimeter PMMA-dosimeter

2005-11-29

2005-11-29

Porta, David (Department: 2878)

Radiant energy

Invisible radiation responsive nonelectric signalling

Optical change type

Reexamination Certificate

active

06969860

ABSTRACT:
A PMMA dosimeter for ionizing radiation shows not only a broad dose measurement range but also sensitivity less depending upon temperature. PMMA having a glass transition point Tg higher than 120° C. is employed as substance sensitive to ionizing radiation such as gamma ray. This gives the PMMA dosimeter characteristics such that (1) absorbance changing rate (measurement light wavelength 320 nm) per 1 kGy at dose of 140 kGy under 25° C. condition is not less than 0.003 ABS/mm and (2) the maximum absorbance ABSmaxand the minimum absorbance ABSminat dose of 140 kGy under a temperature condition range from 10° C. to 50° C. meet a formula ABSmax/ABSmin≦1.06. PMMA dosimeters according to prior arts show characteristics such that sensitivity drops sharply in a dose range over 50 kGy and has a growing dependency upon temperature in a range over 25° C.

REFERENCES:
patent: 4205988 (1980-06-01), Ozaki et al.
patent: 4454421 (1984-06-01), Tanaka et al.
T. Kojima et al., The Gamma-ray Response of Clear Polymethylmethacryate Dosimeter Radix RN15®, Appl. Radiat. Isot., vol. 43, No. 10, 1992, pp. 1197-1202.

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