Essay On Radioactivity Counter

1156 Words5 Pages

Radiation is the process where energetic particles or energy travel through the medium. Human senses cannot sense radiation, so the instruments that detect radiations are developed. Radiation of many types is widely used for non-destructive inspection and testing such as in medical diagnosis, industrial inspection, and in many other field. There are some daily life examples such as microwaves used to cook food, radio waves for radio and television, light etc. In such applications radiation detector play an important role. These detectors are known as Radioactivity counter. Radioactivity counters are the instruments used for detecting the presence of radiations by means of the ionizing effect on an enclosed gas that results in a pulse that is amplified and fed to a device giving either visible or audible indication. Types of radioactivity counters In the field of radiation detectors, the two most popular designs are …show more content…

Sodium-Iodide is a common type of a material which can be used for this purpose. The light which produces from the scintillation process is reflected through a clear window. There it interacts with the device which is called a “photomultiplier tube”. The photomultiplier tube is the first part of the instrument. It is made up of another special material called as “photocathode”. The electrons are produced by the photocathode when light strikes its surface. These electrons are then passes through a series of plates called dynodes. When electrons from the photocathode passes through the first dynode, several electrons are produced. This "bunch" of electrons is then passes to the next dynode, where electron "multiplication" occurs and more electrons are formed. The procedure continues till it reaches the last dynode. The electron pulse is now millions of times larger than they were present in the beginning of the

More about Essay On Radioactivity Counter

Open Document