x ray emission

In a evacuated glass chamber a filament and a metallic target are fixed. The filament is made to emit electrons due to thermionic emission by heating it electrically. The target kept in front of the filament is given a higher potential using a d.c power supply. So the electrons are attrac..

Emission of a and b -rays bring some changes in the nucleus of the atom and the new element formed as a result of these charges is called daughter elemen..

The emission of g - rays does not produce any change either in mass number or in the atomic number of the nucleus. Emission of g - rays is observed in virtually all nuclear reactions from the nuclei, which are left in excited state by an earlier emission..

When a nucleus emits an a - particle its atomic number isreduced by two units and its mass number is reduced by four units. The daughter element, thus formed occupies a position in the periodic table two places left of the parent element. For e.g., the emission of a - particle from produc..

PET is a sophisticated version of radio isotope scanning. The principle behind PET scanning is as follows. Short - lived radio isotopes such as 1 1 C, 1 3 N or 1 5 O are produced and incorporated into a solution (of glucose) that can be injected into the body. As the radio isotope circulates throug..

X-Rays - In 1895, Wilhelm Conrad Roentgen, a German physicist observed, while doing some experiments with the discharge tube, that when cathode rays are allowed to fall on a metal target called anticathode placed in their path, a new kind of rays are produced. These ra..

In 1895, Wilhelm Conrad Roentgen, a German physicist observed, while doing some experiments with the discharge tube, that when cathode rays are allowed to fall on a metal target called anticathode placed in their path, a new kind of rays are produced. These radiations are ..

X-rays and scanners help doctors to learn a great deal about the body as they reveal defects and abnormalities and thus contribute to diagnosi..

Atoms and Nuclei..

This has created a revolutionary change in medical sciences. It can take pictures of fractures in bones and diagnose problems such as lung infection et..