1 Introduction 3 2 Objectives 3 3 Radiological Fundamentals 5
ANSWERS TO UNIT 6 REVIEW QUESTIONS
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- 7 Dose Limits
- 7.2 Declared Pregnant Workers
- 7.3 Non-Radiation Workers
- 8 Personnel Radiation Monitoring
ANSWERS TO UNIT 6 REVIEW QUESTIONS1. minimize 2. As Low As Reasonably Achievable 3. In short, the relative benefit of the activity. Specific considerations may include any or all of the following: cost, lost time, potential corresponding exposure to other risks when reducing radiation exposure, potential increased radiation exposure that may occur during the exposure reduction effort (i.e. dose accrued when installing shielding), public perception, etc. 4. d 5. You
6. time 7. distance 8. shielding 9. Cleaning up debris, tools and materials which have been used during work in the beam enclosure, thereby preventing them from becoming radioactive during operations 7 Dose Limits7.1 DOE Dose Limits and Facility Administrative Control LevelsThe facility administrative control levels for radiological workers are more conservative than the DOE dose limits. They were established to ensure the DOE limits are not exceeded and to support the ALARA concept. The DOE dose limits and JLab administrative control levels are as follows:
The whole body extends from the top of the head down to just below the elbows and just below the knees. This is the location of most of the blood-producing and vital organs. Since the whole body contains the most radiation-sensitive organs, it has the lowest limit. Limits are based on the sum of internal and external exposures. When individual organs are exposed, the following limits apply (the whole body dose limit must still be met). Summary of organ dose limits and JLab control levels.
7.2 Declared Pregnant WorkersA declared pregnant worker is a woman who has voluntarily declared her pregnancy to her employer and is thus subject to a lower dose limit. The declaration must be in writing and may be revoked, in writing, at any time by the expectant mother. (Declaration of pregnancy forms are available from the RCD.) The "declared" pregnant worker and her employer are encouraged to arrange for a mutually agreeable reassignment of work tasks, with no loss of pay or promotional opportunity, in order to maintain her radiation exposure at acceptable levels. For a declared pregnant worker who continues working in radiological areas, the following radiation dose limits will apply:
If the dose to the embryo/fetus is determined to have already exceeded 500 mrem when a worker notifies her employer of her pregnancy, the worker should not be assigned to tasks where additional occupational radiation exposure is likely during the remainder of the pregnancy. It is important to note that the declaration of pregnancy is a voluntary measure taken by the expectant mother. No special dose limitations may be applied to pregnant workers without their written consent in the form of a declaration of pregnancy form. If you have any questions regarding this policy, you should contact the RCD. 7.3 Non-Radiation WorkersThe radiation dose limit for visitors and the public is 100 mrem/year. Review1. The DOE has established a dose limit for the whole body of _________ rem/yr for radiation workers. 2. The extremity dose limit is _________ (higher/lower) than the whole body dose limit. 3. Why are the dose limits for the skin, extremities, and other organs higher than the whole body dose limit? _________________________________________________________________________ _________________________________________________________________________
6. If a pregnant worker does not "declare" pregnancy, her dose limit is __________________. 8 Personnel Radiation Monitoring  
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