ABSTRACT

These are provided at the head of a wastewater treatment plant to

remove large floating objects such as wood and rags.

Unit of ionizing radiation corresponding to energy absorption of 100 ergs

(1 105 J/s) per gram. The rad is a massive radiation dose to a person and another unit for exposure of humans to radiation has been developed.

This is the rem (roentgen-equivalent-man) and corresponds to the

amount of radiation that produces an energy dissipation in the human

body that is equivalent biologically to one roentgen of X-rays. The rad

has been replaced by the Gray (Gy), which is equal to 100 rads.