Contact of the cells of an organism with a substance, micro-organism or radiation. In the case of humans, this may involve contact with a substance or agent by swallowing, breathing, or through the skin or eyes. Exposure may be
exposure], of intermediate duration, or long-term
Exposure can be divided into external and internal.
External exposure refers to the whole
dose to which an organism is exposed.
Internal exposure refers only to that
fraction of the initial chemical dose that is
absorbed and distributed throughout the body via