section Home Production, Amateur Radio amateur Model aircraft, rocket- Useful, entertaining	Stealth master Electronics Physics Technologies invention	space Mystery Earth Mysteries Secrets of the Ocean Stealth section Map
Use of material is permitted for reference (for websites - hyperlinks)

INVENTION
Russian Federation Patent RU1512388
Radioactive sources of polonium-210 ON THE BASIS
AND ITS MANUFACTURING METHOD

Name of applicant:
Name of the inventor: Faddeev SL .; Feofilov OG
The name of the patentee:
Address for correspondence:
Starting date of the patent: 1988.01.26

The invention relates to nuclear physics and can be used for the preparation of highly active sources of alpha radiation on the basis of polonium-210. The aim of the invention is to improve radiation safety and reliability of the sources, and simplify the method for their preparation. The design of the radioactive source layer is in the form of copper and polonida associated with anodnoobrazovannoy of aluminum oxide protective coating film through a layer of chromium or titanium metal thickness 500-1000 . In the method, this is achieved by spraying on the two-layer oxide film of the aluminum layer is chemically stable metal not forming polonium compounds at a temperature of about 400 ° C, deposition on the copper layer retainer polonium metal by heating the resulting preform in polonium vapor at 360 - 380 ° C .

DESCRIPTION OF THE INVENTION

The invention relates to nuclear physics and can be used for the preparation of highly active sources of alpha radiation on the basis of polonium-210.

The aim of the invention is to improve radiation safety and reliability of the sources, and simplify the method for their preparation.

Example. On anodnoobrazovannuyu aluminum oxide film on the aluminum carrier used for serial-type FACT sources cathode plasma or magnetron sputtered method of titanium or chromium layer thickness of 500 and the required amount of copper - lock polonium. The resulting preform was placed in an evacuated volume, at high temperature where there are pairs of polonium, and kept at a temperature of 370 ^° C to obtain an intermetallic compound - polonida copper. On polonid methylene thermal decomposition of nickel carbonyl at 180 ^° C increasing metal substrate and the aluminum dissolved in the carrier solution of bromine in methanol.

Made by this method is a source of anodnoobrazovannoy aluminum oxide film thickness of 2.7 microns, the metal layer of titanium or chromium thickness 500-1000 , Radioactive layer - polonida copper, metallic substrate, alumina-carrier residues.

Anodnoobrazovannaya aluminum oxide protective film withstands heat up to ^about 450 C. Therefore, as a preservative used copper, forming an intermetallic compound with three polonium temperature 360-380 ^° C.

The layer thickness of titanium or chromium 500-1000 practically does not change the spectrum of the radiation protective coating increases the tightness due to "heal" through submicropores anodic film while providing cohesive strength between the protective coating and the metal-locking ~ 200 kg · cm ^-2. Reducing the thickness below 500 accompanied by a deterioration in the sealing and adhesion properties. Increased thickness above 1000 It is inefficient, as it does not lead to increased adhesion or sealing properties, but reduces energy alpha particles. The copper used as a preservative which forms an intermetallic compound with polonium at 350-380 ^{C. The} anodic aluminum protective film withstands without cracking heated to 450 ^° C. Titanium and Chrome have good adhesion to the anodic film ~ 300 kg · cm ^-2 are chemically resistant metals and at ~ 400 ^° C do not interact with polonium.

CLAIM

1. The radiation source 210 based on the position, the substrate comprising a radioactive layer containing polonium-210 and a two-layer protective coating of aluminum oxide film, characterized in that, in order to improve the radiation safety and reliability of the source, the radioactive layer is made of polonida copper and between the radioactive layer and the protective coating is a layer of chromium or titanium metal thickness of 500 - 1000 .

2. The method of manufacturing a radiation source based on Polonium-210, comprising forming the oxide bilayer protective coating on a temporary aluminum substrate, application of polonium capacity constant exposure of the metal substrate and an oxide protective layer removing the temporary substrate, characterized in that, in order to increase the radiation security source and simplify the way to a two-layer coating is applied to the oxide layer of titanium or chromium thickness of 500 - 1000 , Then applied to the copper layer and the resulting preform is heated in pairs with polonium 360 - 380 ^o C.

print version
Publication date 09.12.2006gg

NEW ARTICLES AND PUBLICATIONS
	The technology of manufacture of universal joints for besvarochnogo, threadless, besflyantsevogo connection pipe segments in high-pressure pipelines (a video)
	Oil and petroleum products purification technology
	On the possibility of moving mechanical system due to internal forces
	Glow liquid in a thin dielectric kanaloh
	The relationship between quantum and classical mechanics
	Millimeter waves in medicine. A New Look. IIM therapy
	Magnetic engine
	The heat source on the basis of units nososnyh