Pollution started from prehistoric timeswhen man created the first fires. According to a article in the journal Science, " soot " found on ceilings of prehistoric caves provides ample evidence of the high levels of pollution that was associated with inadequate ventilation of open fires. Core samples of glaciers in Greenland indicate increases in pollution associated with Greek, Roman, and Chinese metal production.
The phenomena of self disintegration by emitting certain invisible rays by the naturally occurring substances, elements and its compounds is called radioactivity. This invisible rays emancipating from the radioactive substances are called radioactive rays and also it can only occurs due to instability of the atoms.
The phenomenon of radioactivity was discovered by A. H Becquerel in purely by accident. He observed a peculiar property of uranium salt, affecting a photographic plate even when the plate was in a light proof package. Radioactive emissions essay termed this property of uranium 'Radioactivity'.
The phenomenon of spontaneous emission of radiation by heavy element is called radioactivity. Later Pierre Radioactive emissions essay Madam Curie showed similar phenomenon in other metals like plutonium, Francium and Radium. Radioactive Emissions A positively charged helium atom.
Has very less penetrating power. Can be absorbed by a sheet of paper or stopped by aluminium foil. Penetrating power greater than alpha ray. Their penetrating power is very great and can pass through several centimetres of lead. Radioactive Isotopes The isotopes which are unstable due to presence of extra neutrons in their nuclei and emit various types of radiations are called a radioactive Isotope.
For example- Carbon, ArsenicSodiumIodineCobalt and uranium - X-rays X-rays is a form of penetrating electromagnetic radiation similar to light. It has a shorter wavelength. Capable of penetrating solids.
Therefore it is possible to produce X- rays photographs for use in medical diagnoses. Nuclear Reaction A nuclear reaction is one in which a nucleus is bombarded with an elementary particle like neutron, proton etc.
The first nuclear reaction was discovered by Rutherford in when he bombarded nitrogen with alpha particles. Nuclear Fission Nuclear fission is the fragmentation of a large nucleus into two smaller nuclei and the liberation of large amount of energy.
In the German scientists Otto Hahan and F. Steersman observed that when uranium was bombarded with slow neutrons then two smaller products were obtained with a tremendous amount of heat. The splitting of uranium is called nuclear fission.
Types of Nuclear Fission Controlled Nuclear Fission-Carried out in nuclear reactors in which rate of fission reaction is reduced and the energy produced can be used for constructive purposes.
Uncontrolled Nuclear Fission- In an atom bomb uncontrolled fission takes place. A very large amount of heat is produced and the process continues until the entire amount of fissionable material is exhausted. The second bomb was dropped on Nagasaki, another city of Japan on August 9, The bomb was made of plutonium Nuclear Fusion It is a nuclear reaction in which lighter nuclei fuse to form a nucleus of greater mass.
In this reaction also an enormous amount of heat IS produced. By carrying on nuclear fusion under controlled conditions, the large amount of energy could be made available for useful purpose.
Atomic Energy Nuclear Energy Energy produced by nuclear fission or nuclear fusion is called nuclear energy or atomic energy. In nuclear reactions there is loss of mass mechanical energy which can be used for various peaceful purposes.
This mass is converted into energy. Isotopes Elements having same atomic number but different atomic mass.Related Documents: Positron Emission Tomography and Radioactive Tracers Essay Moats: Positron Emission Tomography and Pet Essay ABT-Molecular Imaging, is a four-year-old company that manufactures nuclear generators that are used to make nuclear isotopes and radiopharmaceuticals.
A Brief Essay on Radioactive Pollution Article shared by Nuclear energy is a form of energy that’s released during nuclear reactions (splitting of atoms) and has been used to generate electricity.
A major environmental concern related to nuclear power is the creation of radioactive wastes such as uranium mill tailings, spent (used) reactor fuel, and other radioactive wastes. These materials can remain radioactive and dangerous to human health for thousands of years.
Radioactive Isotopes The isotopes which are unstable (due to presence of extra neutrons in their nuclei) and emit various types of radiations are called a radioactive Isotope.
Searching for the best essay on pollution? Read our latest pollution essay for kids and students to know details of environmental pollution. This essay on pollution is has 2 essays one is words other is words. Learn about types of pollution air, water, soil and noise pollution and how to reduce them.
photo essay. See Inside Fukushima's Lethal Reactor. Hannah Beech. Aug 21, nuclear workers struggle to decommission the plant and contain radioactive emissions. Dominic and I .