Radiant energy – Invisible radiation responsive nonelectric signalling – Optical change type
Patent
1975-10-24
1977-01-04
Dixon, Harold A.
Radiant energy
Invisible radiation responsive nonelectric signalling
Optical change type
250461R, 250486, G01N 500
Patent
active
040015874
ABSTRACT:
The color indicator-dosimeter of ionizing radiation in accordance with the invention comprises 70 to 100 parts by weight of a thermoplastic polymer, 10 to 40 parts by weight of a plasticizer, 0.5 to 3.0 parts by weight of a stabilizer and two dyes compatible with said polymer. One of said dyes is incorporated in the color indicator-dosimeter to the extent of from 0.007 to 0.01 part by weight; its G value of decolorization in the polymer is 0.05 to 0.1 molecule/100 eV and its absorption maximum lies in the 450 to 590 nm spectral range. The other of said two dyes is incorporated in the color indicator-dosimeter to the extent of from 0.015 to 0.03 part by weight; its G value of decolorization in the polymer is 0.15 to 1.5 molecule/100 eV and its absorption maximum lies in the 600 to 720 nm spectral range.
The proposed color indicator-dosimeter of ionizing radiation permits measuring dose rates in the range from 0.5 .times. 10.sup.6 to 3.5 .times. 10.sup.7 rad to within .+-. 25 to 30 percent visually and to within .+-.15 to 20 percent objectively. The proposed color indicator-dosimeter of ionizing radiation is not responsive to light; its color does not change after irradiation for at least 12 months.
REFERENCES:
patent: 3226233 (1965-12-01), Agruss
patent: 3290499 (1966-12-01), Vale
patent: 3743846 (1973-07-01), Matsumoto et al.
patent: 3899677 (1975-08-01), Hori et al.
Churov Vyacheslaw Petrovich
Ershova Zinaida Fedorovna
Grinev Mikhail Petrovich
Juzvyak Albert Genrikhovich
Kozlov Leonid Leonidovich
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