Syntheses and spectral properties of longwave absorbing and fluorescing substrates for the direct and continuous kinetic assay of carboxylesterases, phosphatases, and sulfatases
RADIATION DOSIMETRY SOL OR GEL AND RADIATION DOSIMETER COMPRISING SAME AS MATERIAL FOR RADIATION DOSIMETRY
申请人:Riken
公开号:EP3686632A1
公开(公告)日:2020-07-29
There is provided a radiation dosimetry sol or gel, and a radiation dosimeter containing the sol or the gel as a material for radiation dosimetry.
A radiation dosimetry sol or gel characterized by comprising a compound (A) having an excitation light-induced fluorescence property that is changed by a radiolysis product of water; and a silicate salt (B).
A radiation dosimetry sol or gel characterized by comprising a compound (A) having an excitation light-induced fluorescence property that is changed by a radiolysis product of water; a silicate salt (B); a water-soluble organic polymer (C) having an organic acid salt structure or an organic acid anion structure; and a dispersant (D) for the silicate salt (B).
A radiation dosimeter comprising, as a material for radiation dosimetry, the above-mentioned radiation dosimetry sol or gel.
Radiation dosimetry sol or gel and radiation dosimeter comprising same as material for radiation dosimetry
申请人:RIKEN
公开号:US11150358B2
公开(公告)日:2021-10-19
A radiation dosimetry sol or gel, and a radiation dosimeter containing the sol or the gel as a material for radiation dosimetry. A radiation dosimetry sol or gel including a compound (A) having an excitation light-induced fluorescence property that is changed by a radiolysis product of water; and a silicate salt (B). A radiation dosimetry sol or gel including a compound (A) having an excitation light-induced fluorescence property that is changed by a radiolysis product of water; a silicate salt (B); a water-soluble organic polymer (C) having an organic acid salt structure or an organic acid anion structure; and a dispersant (D) for the silicate salt (B). A radiation dosimeter including, as a material for radiation dosimetry, the above-mentioned radiation dosimetry sol or gel.
Described is a self-indicating instant radiation dosimeter (
1001
) for monitoring high energy radiations, such as X-ray. The dosimeter contains a radiation sensitive, color changing, indicating composition (
10
), e.g., a diacetylene (R—C≡C—C≡C—R′, where R and R′ are substituents groups) or a radiochromic dye, a polymeric binder (
20
) and optionally a shelf life extender (
50
) or an activator (
40
). The radiation sensitive composition (
10
) changes color instantly when exposed to high energy radiation. The dose is estimated by comparing the color with a color reference chart or more accurately with a spectrophotometer or an optical densitometer. The radiation sensitive composition (
10
) is protected from low energy radiation such as UV light, by a layer of low energy absorbing materials, such as UV absorbers.
Syntheses and spectral properties of longwave absorbing and fluorescing substrates for the direct and continuous kinetic assay of carboxylesterases, phosphatases, and sulfatases
作者:Ernst Koller、Otto S. Wolfbeis
DOI:10.1007/bf00798280
日期:1985.1
The Unusually Strong Effect of a 4-Cyano Group upon Electronic Spectra and Dissociation Constants of 3-Substituted 7-Hydroxycoumarin
作者:Otto S. Wolfbeis、Ernst Koller、Petra Hoghmuth
DOI:10.1246/bcsj.58.731
日期:1985.2
Synthesis, absorption and fluorescence spectra as well as pKa values of 7-hydroxycoumarins with electron-withdrawing substituents in positions 3 are described. Introduction of a 4-cyano group is achieved by oxidative cyanation of coumarins using potassium cyanide and elemental bromine. 7-Hydroxycoumarins without a 4-cyano group are useful indicators for measuring physiological pH values due to their