Terahertz Rays Can Be Use For Human Body As Well As For Security Purposes.

If you are found of James Bond type of movies, you might have seen special telescope like instruments used for spying purposes. These hand-held instruments are capable of x-raying the rooms and buildings made of stone and concrete. Most of the times these are used by the hero to check how much ammunition is in the building while hero is sitting on the top of the hill.


Well you will be surprised that in reality it is not possible to make use of x-rays through that much small machines. X-rays help in detection of problems in a live body or used in some security equipments but they are quite lethal for human body.

To coup this problem, scientists are working on another type of rays, which are called terahertz rays. These are harmless to body. In a simplest language, terahertz range between lower limits of infrared and upper of microwave. Terahertz are not only less harmful for body but also very helpful in detecting plastic objects, which x-rays can’t do at all. As they can detect lot more objects than the x-rays, they  can be very useful for security purposes.

The technology for Terahertz or T-rays is quite complicated. It has some side effects but its advantages are more than its disadvantages. Scientists are working on this new technology so that we may be able to use this technology with minimum cost and minimum side effects.

CRT and LCD! A little Comparison

A few years ago, CRT or cathode ray monitors were considered to be the back bone of computer but now it seems that they have lost the race with LCD monitors. The earlier LCD monitors had poor picture quality but they became popular because of their small size and low weight. Now the situation is that some of the CRT manufacturers have even stopped making new CRTs. It seems they will be a story of past within the next few years. Although, LCD monitors have improved a lot but even now they are winning the race because of their weight and size (to some extent our snobbish behavior also), however, the picture quality of LCD is still one step behind CRT but it is my personal experience and you have the right to disagree with it.


Like all other human inventions, LCDs have brought a new set of problems with them. There are problems of one or more black spots on the screen, which are caused by dead pixel. Sometimes you find that LCD is showing distorted images. The good news is that although these problems are mostly related to LCDs but such complaints are raised once in a blue moon, however, the genuine problem is cleaning of the LCDs as these are quite sensitive as compared to their competitors so you need to be careful when you are cleaning your LCD.

Life of a CRT depends upon its cathode ray tube and phosphors screen and life of an LCD depends on its backlight know as cold cathode florescent lamps (CCFL) but this is not the final word on CRT and LCD’s life. There are some other factors also like the purpose for which they are used and the quality of materials used at the manufacturing time. If you are planing to buy an LCD or CRT, I would advise you to consult your IT manager before you make the final decision.