Dr. Tsubokura's Radiation Lecture Vol.98
Author: Masaharu Tsubokura
Editors: Akihiko Ozaki M.D., Yuki Senoo
195. The quantity and quality of risk factors determine their impact on health
It has been argued that a high-dose radiation exposure significantly contributes to cancer development. To understand the nature of cancer, this paper briefly introduces its history.
In 1915, Dr. Katsusaburo Yamagoku, a Japanese pathologist, demonstrated the carcinogenesis of chemical substances by applying coal tar on rabbits' ears to induce cancer for the first time in history.
Later, it was revealed that various types of chemical substances could cause cancer. Specifically, the researches on chemical substances familiar in our daily lives, such as food additives and pesticides, have made extensive progress since the 1960s and has led to natural food trends subsequently.
On the other hand, vegetables and fruits