It is important to note that any type of personnel monitor merely records the amount of exposure received. It in NO WAY protects the wearer from the radiation and its associated effects. Dosimetry can be considered in two areas, internal and external.
External dosimetry deals with radiation that originates outside the body.
Internal dosimetry calculates dose equivalents due to sources measured or estimated to be within the body. An example is the dose equivalent due to the intake of I-125 into the body. This chapter discusses dose limits, conditions under which monitoring for internal and external exposures should occur and several methods that can be used for monitoring. All work must be conducted in such a manner that no member of the general public could receive a dose in excess of 100 mrem in one year. All work must be conducted in such a manner that no member of the general public could receive a dose in excess of 2 mrem in any one hour.