-- To provide a basis for evaluating potential worker exposure on a job
and in ALARA preplanning.
-- to provide a baseline for trend analysis, investigation, and correction
of unusual conditions.
-- to track the status of jobs (including identification of good practices)
and to detect departures from good operating procedures and/or the
failure of radiation controls.
-- to identify the origin of radiation exposures in the plant by location,
system, or component.
Health physics personnel should post the results of radiation surveys or
survey maps at the entrance to all permanent radiation areas, high
radiation areas, and very high radiation areas. The results should be
posted in the form of a survey map so that personnel can be aware of the
locations of higher and lower levels of radiation within the area.
A survey data trending program should be conducted; to indicate the
continuing effectiveness of existing control; to warn of deterioration of
control equipment or effectiveness of operating procedures; to show
long-term variations in radiation levels; and to identify and correct
improper radiation work practices.
Health physics should perform trend analyses on all permanent radiation,
high radiation, and very high radiation areas. At a minimum, one
complete survey record should be evaluated and included in the trend
analysis program for each survey required to be performed by the facility
routine control program.
Health physics should use the facility reporting system to identify
discrepancies and abnormal trends and should summarize the data review
results in their monthly reports to the Radiological Protection Manager.
Survey data trends should be investigated when either:
-- an upward trend in general area radiation level occurs, causing a
-- an abrupt change in radiation level occurs that cannot be directly
correlated to normal activities.