SU765887A1 - Material for protecting from x-rays - Google Patents

Description

(54) MATERIAL FOR X-RAY PROTECTION

I

The invention relates to X-ray protection materials that can be used both for clothes of radiologists and as elements of X-ray machines that serve to protect service personnel.

The most widely used protective material in medical X-ray technology is lead rubber (1.

In this material, the metal filler is distributed uniformly throughout the thickness of the material, with the result that this material is characterized by a relatively high yield of characteristic radiation from the metal filler, which is located close to the surface of the material, as well as the radiation material dispersed by the smooth surface.

The closest technical rescue is metal-containing rubbers, consisting of several layers, with the outer layer facing the source of the radiation. metal filler does not contain or is depleted by it 2.

Such an outer layer fully or partially prevents the output of the characteristic.

RADIATION

but the output of the scattered radiation remains high.

The purpose of the invention is to reduce the radiation loads of service personnel.

This is achieved by the fact that in the X-ray protection material on the basis of lead rubber with an outer layer of elastic material, the thickness of the outer layer is from 0.6 to 1.2 mm, and its surface is made rough.

In one embodiment, the surface of the outer layer is corrugated. In another embodiment, the surface of the outer layer is expanded.

FIG. Figure 1 shows one of the embodiments of a protective material in accordance with the invention; in fig. 2 shows the characteristic, scattered and cyMMapHOfo radiation yield curves for a material is according to FIG. 1 depending on the thickness of the outer layer; in fig. 3 shows histograms of secondary radiation spectra from the surface of industrial-grade lead rubber (Za) and the material in accordance with FIG. 1 (36); on fng. 4 shows another embodiment of the protective material in accordance with the above description; in (Fig. 5, the output curves of the characteristic, scattered and total extrusion radiations for the material in accordance with Fig. 4, depending on the thickness of the outer layer. The material contains a layer with metal filler, for example, lead rubber and an outer layer, the surface of which made corrugated and which does not contain metal filler (Fig. 1). When the developed material is irradiated, the primary beam is partially scattered from its outer coating towards the source, and its main part is absorbed in the inner All-containing layer. The characteristic radiation of an a-series of metal atoms in this case will not go to the source, as it is absorbed in the outer layer of material that does not contain metal components. The choice of the thickness of the outer coating layer is of fundamental importance. of which it is visible, but that if layers of a coating containing no metal are applied to lead rubber, with increasing thickness of the outer layer, the characteristic radiation decreases due to absorption in the same layer according to the law close to the exponent (Curve 1), but simultaneously starts to grow and multiple read only radiation from the outermost coating on .zakonu, approximately parabolic (curve 2). However, the curve of the total yield of the characteristic and scattered radiation has a pronounced minimum (curve 3), B because the choice of the thickness of the outer layer in the region of the minimum of this curve will lead to a decrease in the radiation load on the staff. When using and the quality of the material of the outer layer of red rubber it: Intensity J% - as a function of coefficients Coefficient, 6 1 0.72 Intensity, J / olOflf 66

As can be seen from the table, a change in the surface roughness coefficient 6 from a value equal to I to a value equal to 0.39 results in a decrease in the intensity of secondary radiation from a value of 100 ° / o to 52%. Thus, the surface roughness contributes to the absorption of radiation and reduces the output of scattered radiation. The curves in FIG. 2 and 4 correspond to materials with approximately the same coefficient of roughness.

Claims (3)

1. X-ray protection material based on lead rubber with a BHeiuHHM layer of elastic material, characterized in that, in order to reduce radiation loads on the maintenance personnel, the thickness of the outer layer is from 0.6 to 1.2 mm, and its surface is rough. 2. The material according to claim 1, characterized in that the surface of the outer layer is made corrugated. 3. Material according to Claim 1, characterized in that the surface of the outer layer is made of fleecy. Sources of information taken in. attention during examination 1. Baiza K. et al. Radiotechnology of the Academy of Sciences of Hungary, Budapest, 1973, p. 43. 2. US patent number 3239669, cl. 250-108. 1966 (prototype). optimum thickness will be between 0.6 and 0.8 mm. In order to improve the adherence of the outer layer with the main surface, the surfaces to be joined are figured, for example, in the form of beveled furrows or have a dovetail connection. A comparison of the histograms of the spectra of the secondary radiation (characteristic and scattered) from the surface of industrial-grade lead rubber (Fig. 3a) and this material (Fig. 36), obtained under identical irradiation conditions and the registration geometry of the secondary radiation, shows that the output of the secondary radiation is proportional to the area under the histograms for this material is approximately lower than for industrial-grade lead rubber. FIG. 4 shows the material, the outer layer of which consists of a nap and its base. As can be seen from FIG. 5, the parameters of this material are almost identical to the parameters of the material shown in FIG. 1 .. In order to determine the influence of the surface roughness (according to the roughness coefficient S f, where Sn is the total surface area and SB is the surface area. Covered with nap), the absorbing and scattering properties of the developed material are measured on the absorbing and scattered emissions at surfaces with different values of the roughness coefficient. The table shows the results of the experiment with the irradiation of the surface of the material (Fig. 3) with a working beam with it. by generating U of about 50 kV, with a primary aluminum filter of thickness Yu, 05 s. The angle of incidence of the primary beam on the surface of the material is 45 °, with a radiation registration angle of 135 °. irradiation roughness b. .0,53 0,39 56 52 w go yo G5 go and Iff 5 g5 g is ie ui ar 0, Tolshina pontii - SI fut2 tHff t-K3t Power Radiation - KiS Fs3 Tolschkna Iokrnti - with / and / r.5,