External exposures result from radiation sources which are located outside of the body. Conversely, internal exposures result from radiation sources located inside the body.
Internal exposure is more biologically damaging than external exposure.
By minimizing the amount of time spent in a radiation field, the total amount of exposure received will be minimized. Before beginning any new procedures, develop a detailed plan for carrying out the steps. Practice operations to improve dexterity and speed before using radioactive materials. By increasing the distance from a radiation source, the amount of exposure received will be reduced. Do not work directly over open containers of radioactive materials.