least‚ not as we know them‚ says renowned physicist Stephen Hawking‚ potentially provoking a rethink of one of space’s most mysterious objects. A new study from Hawking also says that black holes may not possess "firewalls‚" destructive belts of radiation that some researchers have proposed would incinerate anything that passes through them but others scientists deem an impossibility. (Editor’s note: Watch for our feature "The Truth About Black Holes" in the March issue of National Geographic magazine
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produces hot-spot images‚ which reveal early signs of disease and map how organs are functioning. The low energy gamma radiation it emits‚ the small dose in which it’s injected and it a short half-life (6hours)‚ minimises damage to tissues. The patient’s total exposure to radiation is less than in an X-ray. So far‚ there have been no reported side effects. But use of radiation on the human body can carry many side effects. For instance‚ the high-energy beta-emissions from Co-60 used in radiotherapy
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release of nuclear electrons and radiation. This essay will be discussing one of the applications and uses of the radioactive isotopes‚ and it will also state one problem that radioactive isotopes can address. The radiation characteristically meet four kinds: alpha radiation‚ beta radiation‚ gamma radiation and x radiation. Alpha radiation is weighty‚ that includes a very-short variety element and is in fact a homeless helium nucleus. Some examples of alpha radiation are radium‚ radon‚ uranium
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RADIATION HISTORY Basic Terminology Radiation - A form of energy carried by waves or stream of particles (photons) X-radiation - A high-energy radiation produced by the collision of a beam of electrons with a metal target in an x-ray tube High-energy Radiation - A form of radiation that is able to pass through substances (e.g. the human body) X-ray - A beam of energy that has the power to penetrate substances and record image shadows on photographic film Radiology
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waves are involved. Waves do not have mass or charge. Photons All electromagnetic radiation consists of photons. A photon is a packet of energy‚ or a quantum of electromagnetic energy. Gamma-photons are the most energetic out of all the types of photons. The energy of a photon is directly proportional to the frequency of the electromagnetic radiation of which it is a part of‚ so high frequency radiation means high energy
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Nuclear Chemistry Imagine the majority of Earth being quarantined off and people having to live in specified areas to avoid harmful radiation that originated from nuclear energy/waste. The integration of nuclear energy/medicine is largely controversial among people. Every side to the argument has its benefits as well as its negative consequences. Nuclear energy should not be used in society because of the threat it poses to thousands of people. In contrast‚ nuclear medicine has positive aspects that
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Organic chemistry is the study of essentially all substances containing carbon. Organic compounds that contain only carbon and hydrogen are called hydrocarbons. The simplest hydrocarbons are the alkanes which contain only single covalent bonds. Methane is the simplest alkane. It is also the major component of natural gas. Methane contains only 1 carbon in the molecular formula and the structural formula. There is ethane which is 2 carbons‚ propane that is 3‚ butane which is 4‚ pentane which is 5
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WIRELESS TRANSMISSION 1.2 RADIO PROPAGATION: Radio propagation is the behavior of radio waves when they are transmitted‚ or propagated from one point on the Earth to another‚ or into various parts of the atmosphere. As a form of electromagnetic radiation‚ like light waves‚ radio waves are affected by the phenomena of reflection‚ diffraction‚ and scattering. ERIC SAVIOUR ARYEE OKAI‚ OCT‚ 2013 ASSIGNMENT #1 With the aid of simple diagram(s)‚ explain the three propagation phenomena. ERIC SAVIOUR
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c) Balance formulae equation d) An example of the reaction Question 2 What types of instruments and processes are used to detect radiation? The properties of nuclear radiation are used to detect their levels. Different types of radiation have different effects on the human body. The key properties that are used to detect nuclear radiation include the ability to: * Geiger-Müller tube Geiger-Müller tubes work using ionising effect of radioactivity. It is best at detecting alpha
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steerable beam (radiation direction change) as in smart antennas. 2. They can provide a high gain (array gain) by using simple antenna elements. 3. They provide a diversity gain in multipath signal reception. 4. They enable array signal processing. Hon Tat Hui 1 Antenna Arrays NUS/ECE EE4101 An important characteristic of an array is the change of its radiation pattern in response to different excitations of its antenna elements. Unlike a single antenna whose radiation pattern is fixed
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