![]() This paper presents the results of these surveys, the results of gamma spectroscopy, and a method for releasing existing computer equipment having naturally occurring radioactive materials. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright. Since most surveys of cathode ray tubes in the literature were made while the units were energized and indicated low-energy x-rays, the use of naturally occurring radioactive materials in the manufacture of cathode ray tubes has not been widely recognized. Gamma spectroscopy indicates that the radioactivity is due to naturally occurring radioactive materials. In 1897, Karl Ferdinand Braun developed the first oscilloscope, using a cathode ray tube to see an electrical pulse as it passed through the instrument. Surveys were made of recently manufactured television sets with similar results. Other scientists were able to demonstrate that the 'cathode ray' was actually a stream of electrons. Similar surveys of computer monitors that were never in Contamination Areas confirmed that radioactivity was incorporated into the monitor. Hot spots were found also along the edges and seals of the cathode ray tube. The three glass components of CRTs are the funnel. In a TV's cathode ray tube, the stream of electrons is focused by a focusing anode into a tight beam and then accelerated by an accelerating anode. Cathode-ray tubes (CRTs) from computer monitors and TV sets are a large component of such waste. A cathode-ray tube (CRT) is a specialized vacuum tube in which images are produced when an electron beam strikes a phosphorescent surface. In succeeding years flat-panel TVs became cheaper to produce. ![]() It measured 40 inches in size and cost a whopping 4,000. The anode is positive, so it attracts the electrons pouring off of the cathode. In 2005 CNET reviewed one of the first LCD-based TVs, the Sony KDL-VXBR1. ![]() The radioactivity was primarily on the front face of the cathode ray tube and was not amenable to decontamination. The 'ray' is a stream of electrons that naturally pour off a heated cathode into the vacuum. While surveying used computer equipment out of a zone posted as a Contamination Area, 100% of the computer monitors surveyed had levels of radioactivity that were significantly above background. A cathode-ray tube (CRT) is a vacuum tube containing one or more electron guns, which emit electron beams that are manipulated to display images on a.
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