Abstract
There are many studies made about the effect of irradiation upon the organism, and the causal relationship between the irradiation dose as the action dose and the reaction of the organism to irradiation is the most important and basic problem. The author explained this relationship on the basis of the fundamental forms of dose-effect curve.
According to the conditions of irradiation, some proper unit is selected to express the action dose, but it should express the effective action dose which causes the reaction or express the radiation energy given to the tissue.
Some specific phenomena will be selected to express the grade of reaction, according to the aim of irradiation.
The form of relationship between the action and reaction doses is affected by the kind of organism and the type of reaction selected, and it is shown sometimes by the straight proportion curve and sometimes by the more complicated curve.
The radiation effect is affected by many factors, that is, the time from the irradiation to the observation of the reaction, the kind of organism, the circumstance of the organism, the method of irradiation. Therefore the author emphasized that we should estimate the reaction with rigid conditions, otherwise we could not properly evaluate the obtained dose effect curve.
