Dosimeters are used to monitor your occupational dose from radioactive material or radiation-producing equipment. The University's Radiation Safety Program strives, to the extent practicable, to maintain doses at levels that are As Low As (is) Reasonably Achievable (ALARA). Most individuals working with X-ray producing equipment in the hospital will be issued a dosimeter. For those individuals working in the research laboratory setting, dosimeters will be issued based on the nuclide and total activity that will be used.
The following table will be used as guidance to determine if an individual should be issued a dosimeter to monitor external dose. The guidelines are generally based on total activity used in 1 month.
|Radioisotope(s)||Activity (mCi)||Type of Monitoring|
|C-14, H-3, P-33 & S-35||any amount||none required|
|P-32||< 6 mCi||none required|
|>= 6 mCi
< 30 mCi
|>= 30 mCi||ring dosimeter & whole body dosimeter|
|Ca-45||< 50 mCi||none required|
|>= 50 mCi||ring dosimeter|
|Low Energy Gamma Ray Emitters
< 200 keV (e.g. I-123, I-125, Tc-99m, Tl-201)
|< 50 mCi||none required|
|>= 50 mCi||ring dosimeter & whole body dosimeter|
|High Energy Gamma Ray Emitters
>= 200 keV (e.g. Cr-51, I-131, Co-60, Cs-137)
|< 2 mCi||none required|
|>= 2 mCi
< 5 mCi
|>= 5 mCi||ring dosimeter & whole body dosimeter|
For dosimeter wearers who become pregnant, the Declaration of Pregnancy form provides the University (licensee) with information to "ensure that the dose equivalent to the embryo/fetus during the entire pregnancy, due to the occupational exposure of a declared pregnant woman, does not exceed 0.5 rem (5 mSv)".
University of Virginia Policy ID:SEC-010 - Radiation Protection during Pregnancy contains addtional information
Finally, it is important to return your dosimeter each month or quarter for timely processing by Landauer. Environmental Health & Safety will charge your department for late or unreturned dosimeters. If you have additional questions, call EHS at 434-982-4911 or the UVA Dosimetrist at 434-243-3010.
Applicants with NO Previous Radiation Safety Training
Individuals who are issued dosimeters by EHS must first complete the appropriate online Radiation Safety Guide Lecture.
Applicants with Previous Radiation Safety Training
If you have already completed one of the following radiation safety training courses below and have documentation of such, you do not need to complete either of the above mentioned Radiation Safety Guide Lectures. Please document the course name and date of completion on the dosimeter application form. The UVA Research Compliance Database will be used to verify documentation of training completed by dosimeter applicants.