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US4001587A Expired / Lapsed US ⏱️ 0.0 years remaining

Color indicator-dosimeter of ionizing radiation

Assignee: Individual
•
Filing: 1975-10-24
•
Granted: 1977-01-04
•
Expires: 1995-10-24
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Abstract

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 × 10 6 to 3.5 × 10 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.

Inventors

  • 👤 Georgy Mitrofanovich Panchenkov
  • 👤 Leonid Leonidovich Kozlov
  • 👤 Alexandr Alexandrovich Molin
  • 👤 Zinaida Fedorovna Ershova
  • 👤 Lev Mikhailovich Mikhailov
  • 👤 Albert Genrikhovich Juzvyak
  • 👤 Rail Bakirovich Valitov
  • 👤 Vyacheslaw Petrovich Churov
  • 👤 Mikhail Petrovich Grinev

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-09 21:04
CPC Classifications
G; G01; G01T; G01T1/00; G01T1/02; G01T1/04

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 152 words
A color indicator-dosimeter of ionizing radiation, comprising from 70 to 100 parts by weight of a thermoplastic polymer, from 10 to 40 parts by weight of a plasticizer, from 0.5 to 3.0 parts by weight of a stabilizer and two dyes compatible with said polymer, one of said dyes being incorporated in the color indicator-dosimeter to the extent of from 0.007 to 0.01 part by weight and having a G value of decolorization in said polymer of from 0.05 to 0.1 molecule/100 eV, with the absorption maximum thereof lying in the 450 to 590 nm spectral range, whereas 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 and has a G value of decolorization in said polymer of from 0.15 to 1.5 molecule/100 eV, with the absorption maximum thereof lying in the 600 to 720 nm spectral range.
Claim 2
Dependent Claim 152 words
A color indicator-dosimeter of ionizing radiation, comprising from 70 to 100 parts by weight of a thermoplastic polymer, from 10 to 40 parts by weight of a plasticizer, from 0.5 to 3.0 parts by weight of a stabilizer and two dyes compatible with said polymer, one of said dyes being incorporated in the color indicator-dosimeter to the extent of from 0.007 to 0.01 part by weight and having a G value of decolorization in said polymer of from 0.05 to 0.1 molecule/100 eV, with the absorption maximum thereof lying in the 450 to 590 nm spectral range, whereas 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 and has a G value of decolorization in said polymer of from 0.15 to 1.5 molecule/100 eV, with the absorption maximum thereof lying in the 600 to 720 nm spectral range.
Claim 3
Dependent Claim 53 words
A color indicator-dosimeter of ionizing radiation as set forth in claim 1, wherein the dye having a G value of decolorization of from 0.05 to 0.1 molecule/100 eV and the absorption maximum lying in the 450 to 590 nm spectral range is selected from the group consisting of xanthene, polymethine and pyrazolone dyes.
Claim 4
Dependent Claim 56 words
A color indicator-dosimeter of ionizing radiation as set forth in claim 1, wherein the dye having a G value of decolorization of from 0.15 to 1.5 molecule/100 eV and the absorption maximum lying in the 600 to 720 nm spectral range is selected from the group consisting of triarylmethane, indigoid, thiazine, indophenol, indamine and indaniline dyes.

References Cited (Backward Citations)

US3226233A Cited
US3290499A Cited
US3899677A Cited
US3743846A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1980-01-04 1980-07-05 1981-01-04 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1984-01-04 1984-07-05 1985-01-04 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1988-01-04 1988-07-05 1989-01-04 $7700.00 Window Closed / Lapsed

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