The effective dose was estimated by the operator's film badge
processing provided by the approved individual monitoring laboratory (IRD/CNEN laboratory).
At the end of the monitoring period, perhaps a month, a densitometer is used to measure the optical density of the filter images on the film badge
and determine the amount of radiation to which the film was exposed.
They even said the film badge
must have been issued to me as part of a simulation exercise."
Monitoring is performed with personnel dosimeters such as pocket dosimeters, film badges
and thermoluminescent dosimeters.
When the radiologic technologist participates in any type of fluoroscopy, it is extremely important that the film badge
is worn correctly to ascertain true occupational exposure.
That's why people who work around radiation are required to wear film badges
that measure cumulative radiation exposure.
They had radiation levels recorded by film badges
but most test participants did not.
Uncertainties in dose estimates in the worker cohorts are caused by sampling variation in measurements from film badges
and thermoluminescent dosimeters, adjustments made to doses below the limit of detection, and attenuation of externally measured dose by shielding (Gilbert 1998; Gilbert and Fix 1995).
The light weight portable monitor gives an immediate indication of exposure to ionizing radiation without waiting for film badges
to be developed.