SU567316A1 - Polymeric composition for dosimeter - Google Patents

Abstract

POLISH-YERNAYA CATS FOR DOSIMETER, containing hydrocarbon polymer and radiation-sensitive additive, characterized in that, in order to increase the accuracy of determining the absorbed dose, it contains as radiation-sensitive; an impressive additive is H-substituted 2-aminophenazine of the general formula where R '~. hydrogen, alkyl, alkoxy, halogen, nitro or sulfo; N (R) .2 ^ - dialkylamine 'or cycloalkyl-amine; E ^ = N (R) i; R3 - hydrogen or R ^ together with R ^ - aromatic or heterocyclic cycle conjugated along the side of "a" with phenazium qi of formula 5 '• NCR); R5- _ where X = C or N; R * is alkyl, aryl, hydroxy, dialkylamine or cycLoalkyl-amine; hydrogen, alkyl, alkoxy, alkylamine, dialkylamine, • arylamine or COOH, COOAlc groups ; in the following ratio, wt.%:. . Hydrocarbon polymer 97-99.95. H-substituted 2-aminophenazine 0.05-3.00 < O. (LsO1O5 ^ COO5

Description

The invention relates to the field of chemical dosimetry of ionizing radiation with a dose range of 10 10 rad, namely, polymer compositions for a dosimeter, and can be used to measure the phases of absorbed doses during radiation sterilization of medical devices, in radiobiology, in the food industry,; in agriculture, in dozg metrii.

Known polymer compositions based on chlorine-containing hydrocarbon polymers, including acid-sensitive dyes. With

exposure to radiation, dose-dependent composition over a wide range and is therefore used to make dosimeters

However, using a chlorine-containing hydrocarbon as a polymer matrix, the dosimetric system does not possess radiation similarity to biological and chemical means for which it is necessary to carry out dosimetry or in which radiation-chemical processes are emitted. ,

Therefore, when using such dosimetric systems, there will be a need for incremental recalculations that impede the process of dosimetry.

A dosimeter composition containing a hydrocarbon polymer polymethyl methacrylate and a radiation-sensitive additive is also known.

L.

A disadvantage of these dosimeters is the inability to visually determine absorbed doses due to an inconsistent color transition under the action of ionizing radiation.

In order to determine the accuracy of the definition. dividing the absorbed dose. The polymer composition contains as a radiation sensitive additive an N-substituted 2-aminophenazine of the general formula

K (VD

de R is hydrogen, alkyl, alkoxy, halo, nitro or sulfo;

N (R) - dialkylamine, for example dimethylamine, diethylamine, or cycloalkylamine, for example piperidine, morpholine, pyrrolidine;

R - H (R) j;

..- hydrogen or R together with R is an aromatic or heteroaromatic cycle conjugated on the side a by a phenazine cycle of the formula

where X CH or N;

R is alkyl, aryl, .oxy, dialkylamine, for example dimethylamine, or cycloalkylamine, for example piperidine, morpholine, pyrrolidine;

R is hydrogen, alkyl, alkoxy, alkylamine, dialkylamine, arylamine

5 or groups COOH, COOAk; and taken in an amount of 0.05 to 3 wt.% based on the weight of the composition, respectively, the amount of polymer is 97.00 - 99.95 wt.%. Polymers, for example, polymethyl methacrylate, cellulose triacetate, and methyl methacrylate copolymer are used as a polymer matrix. with styrene and acrylonitrile.

five

When the proposed dosimeters are irradiated with a helix of the absorbed dose, the maximum of the absorption band decreases in the wavelength range of 420–450 nm and the maximum of the radiation-absorbable absorption band increases in the wavelength range of 510–540 nm. The absorbed dose is measured by the photometric method based on the change in the optical density of the films.

5 at the two indicated wavelengths. A decrease in the irradiation of the absorption band in the region of 420–450 nm with the simultaneous appearance of the absorption band at a wavelength of 510–540 nm, the maximums of which are separated by –10 nm, leads to a contrasting color transition from yellow to red, which allows the use of the proposed dosimeters at the same time as

5 color dose indicators for express information visual dosimetry. . I

The proposed composition of the radiation but like most biological

0 and chemical systems, which makes it possible to use them as a model environment for finding the distribution of absorbed doses in these systems,.

five . Fabricated dosimetric films are characterized by high stability to the action of elevated temperature and scattered daylight.

55

Heating non-irradiated samples

It

films up to 50 ° C for 15 days does not cause a noticeable change in their absorption spectra and dosimetric characteristics. The stay of dosimetric films on α-scattered daylight under illumination of 500 lux for 24 h also does not cause noticeable changes in their spectral and dosimetric characteristics.

The quality of the film dosimeters does not deteriorate when stored for

1years 3 within the measurement error of the spectrophotometer, the initial optical density does not change at the indicated time.

Example 1. B6.5 ml of methylene chloride dissolved 1.5 g of a copolymer of methyl methacrylate with styrene and acrylonitrile MCH, and 0.015 g of 3-methyl-5-piperidinopyrido Dz Gz, 2-a of phenazine, dissolved in

2 ml of methylene chloride .. The mixture is stirred until a homogeneous

the masses from which the film is prepared on a glass substrate by irrigation with a knife with a gap of 0.5 mm. The film is dried on a substrate in a horizontal position at room temperature under a glass cover for 1 day, then 3-4 hours at. The thickness of the film removed from the substrate, l-50 microns. When the films are irradiated with gamma radiation Co ° with a power of 0.8 1 rad / h, the following color transitions occur: O Mrad-orange, 2 Mrad-orange-red, 4 Mrad-red, 8 Mrad-red. As the dose increases from 0 to 12 Mrad, the optical density of the dosimeter at a wavelength of 450 does not decrease by 1.1, and at a wavelength of 540 nm, the optical density increases by 0.7.

Example 2. Wb, 0 ml of methylene chloride dissolved 2.0 g of polymethyl methacrylate of mark L-1, add a solution of 0.02 g of 1-methoxy-3- (1) enyl5-piperidinopyrimido 5, A-a Lenazin in 2 ml of chloride methylene. Omesy is poured over the film according to the method described in Example 1, the film thickness removed from the substrate is 45 µm. The change in color of the dosimeter from a dose of gamma radiation is as follows: About Mr-tdy, 2 Mr-orange, 3 Mr-red, 5 Mr-dark-red. When increasing the dose, from 0 to 7 Mrad, the optical density at the wavelength

6

450 nm is reduced by 0.7, and at a length, the wavelength of 540 nm is enhanced by

1.1.

Example 3. Out of 0.004 g of 5-piperidinobenzo (Lenazin, 1.5 g of polymethyl methacryl and 7 ml of methylene chloride) prepare a solution and pour the film out of it according to the method described in Example 1. 1. The thickness of the film removed from the substrate is 50 µm. Change The color of the dosimeter on a dose of gam a-ialucheni is the following: 0 yellow, 1 Mrad-eagleniy, 2 Mrad-krasny, 5 Mrad-dark red. When increasing the dose from 0 to 3 Mrad, the optical density of the dosimeter at a wavelength of 425 nm decreases by 0.55, and at a wavelength of 510 nm, the optical density increased by 0.75.

Example 4. From 5-piperidino-9-methoxy-iso-phenanine and polymethyl methacrylate, the film was prepared according to the method described in Example 2. Thick. 45 microns. The color change of the dosimeter and the dose of gamma radiation is as follows: 0 yellow, 2 Mr-orange, 5 Mr-red. As the dose increases from 0 to 5 Mrad, the optical density at a wavelength of 440 nm decreases by 0.65, and at a wavelength of 520 nm, the optical density increases by 0.6.

Example 5: From 0.01 g of 2,3-di-, piperidinophenazine, 1 g of cellulose triacetate and 6 ml of methylene chloride, a solution is prepared and the film is poured from it according to the method described in example 1. Film thickness, that from a substrate, 30 microns. The change in color of the dosimeter from the dose of gamma, ma-radiation is as follows: 0-yellow, 4. Mrad-orange, 14 Mrad-red. As the dose increases from 0 to 10 Mrad, the optical density at a wavelength of 440 nm decreased by 0.6, and at a wavelength of 510 nm increased by 0.3.

The color film chemical dosimeter, in which the following are used as radiation-sensitive components: E-substituted 2-aminophenazines, has a high radiation similarity to many biological and hydrocarbon chemical systems, has a contrasting color transition from yellow to red with increasing height polished dose, which allows its use for visual rapid dosimetry, as well as for determining

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spatial and rjyydHHHoro dis- (to) and to the action of the scattered

determining the intensity of ionizing daylight (up to 24 hours with illuminated radiation and absorbed doses. Dose of 500 lux). It does not have its own meter. It has a high stability of storage during storage.

to the effect of increased temperature of 1 year.

Claims (1)

A POLYMER COMPOSITION FOR A DOSIMETER containing a hydrocarbon polymer and a radiation-sensitive additive, characterized in that, in order to 'increase the accuracy of determining the absorbed dose, it contains S-substituted 2-aminophenazine of the general formula as a radiation-sensitive additive