Title : THE CENTENNIAL OF THE DISCOVERY OF X-RAYS
Stamp Serial#
1841 
KPC#
C-1397 
MICHEL#
1865 
StanGib#
2177 
Scott#
1833 
Date of Issue
11/08/1995 
Quantity
3,000,000 
Denomination
150 won 
Design
A portrait of Roentgen and X-rays 
Designer
Cho Jung-hyun 
Image Area
33mm*23mm 
Perforation
13 
Sheet Composition
Sheet of 20(5*4) 
Paper
Print
Korea Minting and Security Printing Corporation 
Description
November 8, 1995 marks the 100th anniversary of the discovery of X-rays.

While experimenting with a vacuum tube (Crookes tube) to produce cathode rays, Wilhelm Conrad Roentgen, a German physicist, discovered a mysterious instance of electromangetic radiation with wavelengths of 0.01100 angstroms (1 angstrom [] equal to 110-8mm)between the ranges extrems of ultraviolet and gamma-ray (r-ray)ranges on November 8, 1895. He dubbed the newly discovered from of radiation the X-rays, to indicate that its nature was unknown. X-rays are invisible and are characterized by their particular types of behavior in reflection, refraction, and diffraction. They have high fluorescent, polarizing and penetrating power.

The dicovery of X-rays ushered in a new era of grealy increased precision in the diagnostic examination of the human body. Until then, medical diagnoses relied on visul inspection, percussion and auscultation. Beyond their well-known applications in the diagnosis and treatment of diseases, and sterilization of food and pharmceuticals, X-rays are also a major tool in archeological research and in industrial applications. X-ray inspection, in particular, is used in more than 70 percent of diagnosing activities throughtout the world. Roentgen received the first Nobel Prize in physics in 1901, for his discovery of X-rays.

Marking the centennial of the discaovery of X-rays and the 150th anniversary of Roentgen's birth, the Ministry of Information and Communication is issuing a commemorative postage stamp to celebrate the significant contribution of X-rays as an essential element to further scientific development in the next century.