At the University of Washington, radiation dosimetry is provided to monitor
occupational radiation exposure for those workers who use radiation sources
under certain conditions. University of Washington dosimeters should
not be used to measure occupational doses received at any other institution
or to measure doses from non-occupational sources such as medical x-rays.
State and federal regulations require that those persons who are likely
to receive 10% or more of the annual
radiation dose limits must be provided with radiation dosimetry.
This means that federal and state regulations require monitoring for any person likely
to receive a whole body dose of 500 mrem or more or a skin or hand dose
of 5000 millirem or more.
Under University of Washington requirements, you must wear dosimetry if:
You operate x-ray machines (including open x-ray diffraction equipment)
You are a Declared Pregnant Worker working in a lab where x-ray and gamma
emitters or energetic beta emitters are used
If you use open sources of radioactive materials under certain conditions
If you use sealed sources under the following conditions:
|Na-22, Co-60, Cs-137 and Ra-226
and other energetic beta/gamma emitters
| Used in amounts 10.0 mCi
More Information about Dosimeters
The University of Washington Radiation
Safety Manual contains additional information on dosimeters.
Dosimetry is not routinely provided to workers who do not meet the criteria
described in the Required Dosimetry section.
If you have concerns about your radiation exposure and would like to
be monitored even though you do not meet the Required
Dosimetry criteria, you may either contact Radiation Safety directly or you may
ask your Authorized User or your lab manager to request dosimetry for you.
If you request dosimetry even though you do not meet the Required Dosimetry
criteria, dosimetry will be provided for you for a year. After the
first year of monitoring, Radiation Safety will review your dose history
and determine whether dosimetry should be continued.
In 2002 the University implemented a Dosimetry Policy to curtail the number of unreturned
and missing dosimeters University of Washington
Unreturned Dosimeter Policy Prior to the implementation of the
current dosimetry criteria and over the last 25 years, the University of Washington
provided radiation dosimeters to many more workers than is required.
In 2002, the University of Washington provided dosimeters to about
1400 people per year. Approximately 90%+ of all monitored persons received
no measurable dose.
During this period of time, no one using sealed sources received a dose high
enough to require monitoring under federal regulations.
This is the end the Dosimetry Module, which is the sixth of the seven
Sealed Source Radiation Basics modules. The next module is the Using
Sealed Sources Safely Module.
Safely With Sealed Sources (Module #7)
to the Sealed Source Training Introduction Page