With regard to the history of isotopes, in 1895 W.K. Roentgen discovered X-rays and in 1913 isotopes were found by F. Soddy. In 1933 I. Curie and F. Joliot found an artificial phosphorus isotope with radioactivity P-32. That was the first isotope produced in a laboratory rather than occurring naturally. After many milestones, reached by many scientists, the study of and applications of isotopes started to flourish and they began to be used widely in such areas as genetic engineering, medical and biochemistry applications, chemical engineering applications, and agriculture studies. Technically, the primary advantage of application of radiation from isotopes is low heat, or mass energy transmission; it is easy to control; no catalyst is needed; there are no contamination concerns and it is relatively inexpensive.