However, the current assumption is that there is no threshold of exposure below which x-radiation may not adversely effect human health. Scientists have not identified specific health effects resulting from exposure to extremely low doses of low-level radiation over prolonged periods of time. This unintentional emission of x-radiation can pose a potential hazard and must be controlled. These components may produce x-rays capable of escaping from the television receiver or CRT. Since many of the components in television sets operate at thousands of volts, there is the potential for x-ray generation. X-rays may be produced when electrons, accelerated by high voltage, strike an obstacle while traveling in a vacuum, as in a TV containing a cathode ray tube (CRT). In others, as with TV sets, radiation emitted is not intentional and is not essential to the use of the product. In some cases, as with diagnostic x-rays, radiation emitted from these devices is intentional and serves a useful purpose. These include diagnostic x-ray machines, television sets, microwave ovens, radar devices, and lasers. Much of the manmade radiation people are exposed to comes from electronic products. We are also exposed to manmade radiation, which can and must be controlled. This is called background radiation and cannot be controlled. We are surrounded by natural radioactivity in the earth and by cosmic rays from outer space. Man cannot escape exposure to some radiation. Putting Television Radiation in Perspective Assuring That TV Sets Meet the Radiation Standard.Putting Television Radiation in Perspective.THE SMALLEST AND LIGHTEST POSITIVE ION WAS OBTAINED FROM HYDROGEN AND WAS CALLED PROTON. The behavior of these particles in a magnetic or electric field is opposite to that of electrons or cathode rays. Some positively charged particles carry a multiple of a fundamental unit of electric charge.Ĥ. The charge to mass ratio of particles depends on the gas from which it originates.ģ. Those are simply the positively charged gaseous ions.Ģ. The positively charged particles depend upon the nature of gas present in the cathode ray tube. The experiment for canal rays was carried out in modified cathode ray tube, by E. the cathode rays consist of electrons, while the anode/canal rays are the positively charged gaseous ions. You are right, both kinds of rays are emitted simultaneously. The gold foil was surrounded by a detector screen that would flash when hit with an α \alpha α alpha particle. Most of the radiation was absorbed by the lead, but a thin beam of α \alpha α alpha particles escaped out of the pinhole in the direction of the gold foil. In this case, Rutherford placed a sample of radium (a radioactive metal) inside a lead box with a small pinhole in it. Alpha particles are helium nuclei ( 2 4 He 2 ) (_2^4\text) ( 2 4 He 2 ) left parenthesis, start subscript, 2, end subscript, start superscript, 4, end superscript, start text, H, e, end text, start superscript, 2, plus, end superscript, right parenthesis, and they are given off in various radioactive decay processes. In his famous gold foil experiment, Rutherford fired a thin beam of α \alpha α alpha particles (pronounced alpha particles) at a very thin sheet of pure gold. The next groundbreaking experiment in the history of the atom was performed by Ernest Rutherford, a physicist from New Zealand who spent most of his career in England and Canada.
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