X Ray Definition and Properties (X Radiation)

X Ray Definition and Properties (X Radiation) X-rays or x-radiation are part of the electromagnetic spectrum with shorter wavelengths (higher frequency) than visible light. X-radiation wavelength ranges from 0.01 to 10 nanometers, or frequencies from  3Ãâ€"1016  Hz to 3Ãâ€"1019  Hz. This puts the x-ray wavelength between ultraviolet light and gamma rays. The distinction between x-ray and gamma rays may be based on wavelength or on radiation source. Sometimes x-radiation is considered to be radiation emitted by electrons, while gamma radiation is emitted by the atomic nucleus. German scientist Wilhelm Rà ¶ntgen was the first to study x-rays (1895), although he was not the first person to observe them. X-rays had been observed emanating from Crookes tubes, which were invented circa 1875. Rà ¶ntgen called the light X-radiation to indicate it was a previously unknown type. Sometimes the radiation is called  Rà ¶ntgen or Roentgen radiation, after the scientist. Accepted spellings include x rays, x-rays, xrays, and X rays (and radiation). The term x-ray is also used to refer to a radiographic image formed using x-radiation and to the method used to produce the image. Hard and Soft X-Rays X-rays range in energy from 100 eV to 100 keV (below 0.2–0.1  nm wavelength). Hard x-rays are those with photon energies greater than 5-10 keV.  Soft x-rays are those with lower energy. The wavelength of hard x-rays is comparable to the diameter of an atom. Hard x-rays have sufficient energy to penetrate matter, while soft x-rays are absorbed in air or penetrate water to a depth of about 1 micrometer. Sources of X-Rays X-rays may be emitted whenever sufficiently energetic charged particles strike matter. Accelerated electrons are used to produce x-radiation in an x-ray tube, which is a vacuum tube with a hot cathode and a metal target. Protons or other positive ions may also be used. For example, proton-induced x-ray emission is an analytical technique. Natural sources of x-radiation include radon gas, other radioisotopes, lightning, and cosmic rays. How X-Radiation Interacts With Matter The three ways x-rays interact with matter are Compton scattering, Rayleigh scattering, and photoabsorption. Compton scattering is the primary interaction involving high energy hard x-rays, while photoabsorption is the dominant interaction with soft x-rays and lower energy hard x-rays. Any x-ray has sufficient energy to overcome the binding energy between atoms in molecules, so the effect depends on the elemental composition of matter and not its chemical properties. Uses of X-Rays Most people are familiar with x-rays because of their use in medical imaging, but there are many other applications of the radiation: In diagnostic medicine, x-rays are used to view bone structures. Hard x-radiation is used to minimize absorption of low energy x-rays. A filter is placed over the x-ray tube to prevent transmission of the lower energy radiation. The high atomic mass of calcium atoms in teeth and bones absorbs x-radiation, allowing most of the other radiation to pass through the body. Computer tomography (CT scans), fluoroscopy, and radiotherapy are other x-radiation diagnostic techniques. X-rays may also be used for therapeutic techniques, such as cancer treatments. X-rays are used for crystallography, astronomy, microscopy, industrial radiography, airport security, spectroscopy, fluorescence, and to implode fission devices. X-rays may be used to create art and also to analyze paintings. Banned uses include x-ray hair removal and shoe-fitting fluoroscopes, which were both popular in the 1920s. Risks Associated with X-Radiation X-rays are a form of ionizing radiation, able to break chemical bonds and ionize atoms. When x-rays were first discovered, people suffered radiation burns and hair loss. There were even reports of deaths. While radiation sickness is largely a thing of the past, medical x-rays are a significant source of man-made radiation exposure, accounting for about half the total radiation exposure from all sources in the U.S. in 2006. There is disagreement about the dose that presents a hazard, partially because risk depends on multiple factors. It is clear x-radiation is capable of causing genetic damage that can lead to cancer and developmental problems. The highest risk is to a fetus or child. Seeing X-Rays While x-rays are outside the visible spectrum, its possible to see the glow of ionized air molecules around an intense x-ray beam. Its also possible to see x-rays if a strong source is viewed by a dark-adapted eye. The mechanism for this phenomenon remains unexplained (and the experiment is too dangerous to perform). Early researchers reported seeing a blue-gray glow that seemed to come from within the eye. Source Medical Radiation Exposure of the U.S. Population Greatly Increased Since the Early 1980s, Science Daily, March 5, 2009. Retrieved July 4, 2017.

Causes of Tropical Deforestation Essay Example | Topics and Well Written Essays - 250 words

Causes of Tropical Deforestation - Essay Example From the  Ã‚   factors  Ã‚   above, small-holder agriculture comprises 35 – 40%, thus, holding the biggest share. Cattle pasture comes  Ã‚   next while large-scale agriculture cops the fourth spot. It is obvious   that   agricultural activities vastly contribute to deforestation.  Deforestation in the Brazilian Amazon (   2000 – 2005)   Cattle  Ã‚   ranching  Ã‚   is  Ã‚   the top cause of deforestation. Small-scale agriculture is followed by large-scale agriculture. Logging along  Ã‚   with other causes round up the list with 1 – 3%.   Although logging results in degradation rather than deforestation, it is often followed by clearing for agriculture.   The 1980s saw 80% of deforested land ultimately converted for extensive agriculture which was lessened by 20% by the 90s. The decrease in the figures could account for less space that can be used for agricultural purposes since companies could have taken over the operations of large-sca le agriculture. It is also a probability that when world price of beef increased, the demand   lessened; thus, volume of cattle grazing on lands decreased that resulted to slower deforestation .Tropical Deforestation by Region, 1990 – 2000, & 2000 – 2005   South America lost the most number of hectares to deforestation. From   1990 – 2000, the region has lost more than 3,500 hectares per year. Deforestation  Ã‚   slowed down between  Ã‚   2000 – 2005. This meant that population has grown and urbanization has sped the deforestation. Africa suffers the second worst with 3,600 hectares of land lost to deforestation per year in the period 1990 – 2000.

Period of Baroque Essay Example | Topics and Well Written Essays - 1250 words

Period of Baroque - Essay Example Renaissance, through its new ideology and reform, resulted with a variety of styles. The idea of individualism and freedom of artistic creations influenced Michelangelo in a different manner. He was, in a way opposite of Leonardo. He was emotional and inward oriented. While painting the ceiling of the Sistine Chapel, he described the creation of the universe in his own way. He represented God as an old man with bears, most probably because of the humanism. Also, the humanism of Renaissance allowed him to represent a naked man, together with God, in same size. Renaissance was a start of reform and it was a return to classical values. In opened a new viewpoint in terms of ideology and style. After Renaissance, Baroque period have started. The artistic center moved from Florence to Rome. The reconstruction and redecoration of Rome gave rise to different artistic ideas and styles. One of the features of Baroque which distinguished it from Renaissance period is that it was international. Baroque style spread all through Europe, it was also accepted in Russia and passed into the New World. Caracci and Andrea Pozzo became famous with their ceiling frescoes and Caravaggio with his style, his way of representing figures and use of light etc. The paintings on ceilings in Baroque period differed from Renaissance. In this period the paintings became more elaborate and variety of images created an allegory in a way, representing the glorification of the miracles. There were flying figures on ceilings. and everything took place above us. Therefore the perspective moved from walls to ceilings and scientific reality gave its place to illusion and movement. The Baroque period had its own way of representing naturalism and reality. Michelangelo Merisi Da is better known as Caravaggio and he was an Italian baroque painter. His works portrayed saints and other biblical figures as plain ordinary people. Little is known about his early life but one might assume from his painting that he was a very catholic person with good morals. But actually this is not the case- His fame came when he unveiled his three life size paintings narrating the life of Saint Matthew in 1600. At that time his life was filled with notorious violence. It is said that a full transcript of his trial pending and police records would fill several pages. Several of these violent incidences almost ended in his death. He was later ordered to quit Rome after one of his alliances was killed during a violent accident. He wanted to paint saints and biblical figures

Earth science Essay Example for Free

Earth science Essay Speculations of the actual rate of global warming had been contradictory to the least. In fact, there have been arguments that the year 1998 and not 2005 is the warmest year recorded. However, based on the global climate simulation models, warming considerably larger in the Western Equatorial Pacific than in the East Equatorial Pacific. The authors also suggested that the increased East-West temperature gradient may have also increased the likelihood of El Nino such as those in 1983 and 1998. Global temperature is a gauge used for measuring and summarizing the state of global climate. Although the effects on climate are normally felt locally, its distribution nonetheless is congruent with that of the climate models. According to the Goddard Institute for Space Studies Analysis, the estimated uncertainty of global mean temperature implies that we can only state that 2005 was probably the warmest year. This conclusion was based on satellite measurements of sea surface temperature since 1982, a ship-based analysis for earlier years and documented procedures for data over land. Also, this analysis has a 95 percent confidence. As mentioned earlier, 2005 is noted for its warmth and this is not due to the contribution of the El Nino phenomenon contrary to the one recorded in 1998 wherein 0. 2Â ° C was lifted from the trend line and considered to be the strongest in the century. Hence, global warming is tallied to be at 0. 6Â ° C in the past decades and 0. 8Â °C higher than in the past century. Contrary to what was speculated before, it is now incorrect to say that most global warming occurred before the 1940s. This may be attributed to the large fluctuations and yet slow warming over the century until 1975 which was then followed by a rapid warming, noted at 0. Â °C per decade. Hence, global warming is not just a concocted artefact due to the measurements in urban areas and used to scare people into being earth friendly but a real climate change. It is confirmed by surface temperature change inferred from borehole temperature profiles at remote locations, the rate of alpine glaciers around the world and progressively earlier breakup of ice on rivers and lakes. (10). Moreover, the fact that there is indeed a geographical distribution of warming gives proof that there is a real climate change. The largest warming recorded occurred not in urban areas but in remote regions including high latitudes. Furthermore, warming has also been documented in ocean areas, which are considerably far from the direct effects of humans. On the other hand, calculations made through the first global climate model, presented in the congressional testimony in 1988 was allegedly 300 percent wrong. However, further analysis indicated that the first transient climate simulations proved to be quite accurate and certainly not wrong by 300 percent.

To Know a Fly Essay example -- Vincent G. Dethier To Know a Fly Essays

To Know a Fly The book, To Know a Fly by Vincent G. Dethier, is about a scientist who fell in love with the fly. Professor Dethier isn’t like most scientists who are idolized for their accomplishments and rejected for the lack of ability to communicate with society. He was known for being an outstanding researcher, and he also had the wonderful gift of communication. The fact that he was fascinated by the knowledge that could be obtained from such a simple species, such as the fly, also made him popular with the public. The main focus of the book involves Professor Dethier designing and performing various experiments. Each experiment done by Professor Dethier is very simple, therefore the reader is informed, and as Professor Dethier adds interesting facts about the experiments of the fly the reader can interpret it easier. Professor Dethier begins the book by explaining how science and scientist are often misunderstood. He continues by stating that anyone can be a scientist if they want w ish. However, they must posses certain characteristics such as love for nature, curiosity of life, and a soaring imagination. After convincing the reader that they can understand and appreciate science, Professor Dethier begins to inform the reader about the fly. He begins by defending the fly. Most everyone has a mutual understanding that flies are pests and are often considered to be disease infested. Most people don’t even want to be in the presence of a fly. Moreover, flies aren’t ...

Anti Guns on Campuses Essay

Guns are a double-edged sword when it comes down to it. Guns provide many people the ability to feel safe and protected, while other guns are constant reminder that some freedoms are taken too far. Guns privileges are abused, misused, and mistreated. Young people glorify toting weapons like it’s a new fashion statement. Missing the fact, that what in reality is causing uproar and panic amongst everyone else. That is why I feel like guns should not be allowed on college campuses. Asking a young person to take the responsibility of not only carrying but carrying a gun around on a college campus is a lot to ask of a college aged young adult. Most people in college struggle with grasping a full-course load, let alone walking with a gun, or the fact that someone unbeknownst to them could be carrying an automatic weapon. The theory is not brilliant; if a situation occurs we should let the proper authorities handle it, in a professional manner in which they are paid to do so. Law enforcement is more than just capable of doing their job, in a professional sense. It makes sense for police to patrol all throughout a college campus to keep peace. Asking an 18- 24 year old who is still mentally and emotionally adjusting to life and new experiences is too much. College campuses are actually safer than the surrounding communities where an actual 93% of crimes that occur against college students take place. That in it of itself is an eye opener to those for gun on college campuses. College campuses are a safe heaven, where students can be at ease, and be at peace knowing that they are protected 24/7. Lawmakers should take joy as well. Campus police is actually doing what’s asked of them and doing it above and beyond. Police are doing what is asked of them. Now imagine if a student or even faculty member such as a teacher with no crisis training is asked to respond to an emergency situation? Many if not most would panic and not how to respond to the situation at hand. Situations could lead to disaster, so why not leave that to the professionals. Clearly not having guns on college campuses has worked so far. Why would society decide to change that now? The negatives outweigh the good in every facet. Yes like with anything there are positives, but those positives are few and far between. Students and faculty aren’t trained to handle the pressures and stress that come with dealing with carrying a loaded weapon on campus. Law Enforcement does a heck of a job, in protecting all persons on campuses now. By switching that up, you are making police officers job even way more difficult, asking them to distinguish in crisis situations who and who isn’t the culprit. Making them find out who has the gun? Guns should be allowed on college campuses period.

Failing Forward Explains That Most People Fail At Some

Failing Forward explains that most people fail at some point in their lives it is how you chose to learn from the failures. These failures allow us to learn from our mistakes. You can turn a failure into a learning experience and while it is hard to face any type of failure once you accept that you failed you can grow from that situation. The book takes into account that failure is unavoidable and you need to learn from all your mistakes. When I first received the decision of my case I was devastated. I thought all my hard work was for nothing until I read Failing Forward. I have received much knowledge from reading the book. Firstly, I learned the difference between people who fail and achieve comes from positive attitude,†¦show more content†¦People cannot give up trying just because they failed at one thing. When people quit at the first sign of failure they will never know if they could have succeeded in something else. Failure is temporary. It is not a lifelong event. Failures are individual incidents in which mistakes are made they do not define the future. In order to achieve people must keep a realistic expectation. For example, setbacks do not fix themselves over night. It takes time to be able to move forward from a failure. The best way to overcome setbacks is to remember success. If one focusses on the only thing they failed in and not their achievements, it will take longer to overcome failure. Once you focus on your strengths and how those strengths can be utilized in situations your weaknesses will not define the situations. Thomas Edison said, â€Å"Many of life’s failure s are people who did not realize how close they were to success when they gave up.† Taking action is the next step to failing forward. Failure can cause many emotional problems. One of these problems is fear. As described in the book, there are three things brought on by fear that prohibit people from taking action. Firstly, Paralysis keeps people from taking action because they fear failure. Once someone fails, they do not want to fail again so they do nothing to promote failure or success. Procrastination makes taking action forward much harder. When someone procrastinates, they are burning the potential to workShow MoreRelatedSuccess Is Not Always Come Easy1722 Words   |  7 Pagesare living right now. We all share something in common; the desire to be successful. The dictionary definition of success is â€Å"the favorable or prosperous termination of attempts or endeavors; the accomplishment of one’s goals† (Dictionary.com). Some people define success as being happy, loving, faithful, wealthy, famous, and powerful. Even though success can be achi eved by anyone, it does not always come easy. First, to become successful you have to be able to accept failure, and move on. Them youRead MoreThe Rational Irrationality Complex1147 Words   |  5 PagesAccording to John Cassidy, markets fail due, not because of greed but rather to the fact that they act irrationally. Their irrational decisions and results can be, in part, hindered and corrected by government intervention. That markets fail mostly due to irrationality rather than to greed can be seen from the scenario of the retail bookstores, particularly Borders, vs. that of e-book publishing. It appears that e-book publishing may have a future (PWC, nd), but many book stores are slow to acknowledgeRead MoreWhy Starbucks Fought For Its Life Without Losing Its Soul1349 Words   |  6 Pagescoffee filling your body with a pleasant warmth. I can always look forward to starting my day off, with a steaming cup of coffee, I love that even if it s a cold, dark, and gloomy day outside, a big cup of coffee can get me through the day. I could go on and on about my appreciation and fondness over the drink itself, but I won’t. However, I would like to share with you a remarkable phenomenon that I’ve come to notice, it is other people sharing this experience, this love for coffee, and they do it allRead MoreWhy Nations Fail : The Origins Of Power, Prosperity And Poverty1274 Words   |  6 Pagesbetween the developed and developing nations of the world. Some nations are prospering greatly while others countries are still struggling to achieve, economic, political, and social stability. The book Why Nations Fail: The Origins of Power, Prosperity and Poverty by Daron Acemoglu and James A. Robinson attempts to explain why some nations have seen great success in their economic and political development, and why other n ations are still failing to develop in this way. The arguments derived come fromRead MoreHelp Me Nigga Character Analysis1180 Words   |  5 PagesIn Kevin Hart’s stand-up comedy show titled â€Å"Let Me Explain – Witness the Rise of A Legend,† Kevin Hart goes on a comedic rant about the changes he went thru doing his marriage and before, during and after his divorce that led him to become the person he is today. One comedy bit that stood out to me the most was entitled â€Å"Help Me Nigga.† Kevin begins this bit by stating that cheating was the reason why his marriage failed, but immediately after stating this turns around and states that is was actuallyRead MoreThings Fall Apart By Chinua Achebe1654 Words   |  7 Pagesâ€Å"By failing to prepare, you are preparing to fail.† [Benjamin Franklin] In the book, Things Fall Apart, by Chinua Achebe, Okonkwo prepares for himself to fail in his later years of life. Okonkwo’s mental attitude kep t him from preparing himself for success when his clan started to fall apart. Throughout the book, Okonkwo developed a personality that restricted him from accepting reality, and when his fantasy world fell apart, his lack of preparation and his attitude led him to failure. Okonkwo keepsRead MoreCapital Analysis : Capital And Income Inequality Essay1743 Words   |  7 Pagesmany most famous Economics magazines such as Quarterly Journal of Economics, the Journal of Political Economy, the American Economic Review and the Review of Economic Studies. He is specialized in the wealth inequality, and he has done a lot of historical and theoretical work on the interplay between economic development and the distribution of income and wealth. Based on historical and statistical methods, his work shows the rate of capital accumulation in relation to economic growth. Some of hisRead MoreProject Management1394 Words   |  6 Pageslevel of importance and explain your reasoning. Project managers occupy a unique and often precarious position within many firms. Possessing little formal authority and forced to operate outside the traditional organizational hierarchy, they quickly and often belatedly learn the real limits of their power. It has been said that an effective project manager is the kingpin, but not the king. They are the bosses, it is true, but often in a loosely defined way. Indeed, in most firms they may lack theRead Moresociology internationalist crime deviance1200 Words   |  5 Pagesï » ¿1c How do interactionists explain crime? (Labelling Theory) Are offenders different? Interactionists argue that a mistake most perspectives make is that they assume lawbreakers are somehow different from law-abiding people. The labelling theory suggests that most people commit deviant and criminal acts but only come are caught and stigmatised for it. It is for this reason that emphasis should be on understanding the reaction and definition of deviance rather than the causes of the initial actRead MoreCritique Of Systematic Control Perspective Essay1378 Words   |  6 PagesSystematic Control Perspective is stemming from a Rational Choice Theory in it’s believe that people make rational choices before their actions. It presents a view that all humans are prone to make intelligential, logical decisions and any false step therefore is subject to punishment. Our current criminal justice system was practically build on that notion. It was created to be convenient and straight-forward, disregarding factors that might have an impact on an individual to commit a crim e. While SCP