Click here to make tpub.com your Home Page

Page Title: Example 5.3. Circumstances Not Requiring Routine Individual Monitoring
Back | Up | Next

Click here for thousands of PDF manuals

Google


Web
www.tpub.com

Home

   
Information Categories
.... Administration
Advancement
Aerographer
Automotive
Aviation
Construction
Diving
Draftsman
Engineering
Electronics
Food and Cooking
Logistics
Math
Medical
Music
Nuclear Fundamentals
Photography
Religion
   
   

 



DOE-STD-1121-98
Example 5.3. Circumstances Not Requiring Routine Individual Monitoring
C
Radioactive materials are in a sealed source or special form.
C
Radioactive materials are packaged in accordance with Department of Transportation
specifications.
C
Quantities of radioactive material in process are less than 2% of an ALI.
The requirement in 10 CFR 835 is that monitoring be provided for workers who are likely to receive
a potential alpha energy exposure (PAEE) above background that would lead to a committed effective
dose equivalent HE,50 of 100 mrem in a year. The corresponding exposures are 0.08 WLM for 222Rn
progeny and 0.24 WLM for 220Rn progeny. Monitoring would normally include breathing zone air
sampling using lapel air samplers or etched-track detectors, or fixed air monitors with records of stay
times.
Because of compelling special circumstances, a few contractors have been able to get regulatory
relief under 10 CFR 820.62. The problem arises from the inability at these sites to distinguish between
natural and occupational sources of radon and thoron exposure. At these sites, monitoring is provided for
workers who are likely to receive a PAEE including background that would lead to a committed effective
dose equivalent HE,50 of 500 mrem in a year: this is 0.4 WLM for 222Rn progeny and 1.2 WLM for 220Rn
progeny. Monitoring would normally include breathing zone air sampling using lapel air samplers or
etched-track detectors, or fixed air monitors with records of stay times.
Both approaches to a monitoring are based on exposure, which includes both air concentration and
amount of time breathing the air. It is important to point out that workers may be permitted to work in
significant concentrations of potential alpha energy for short periods of time with no personnel
monitoring, providing they don't exceed the likelihood of receiving an HE,50 of 100 mrem or 500 mrem
(depending on whether the site has obtained an exemption from 10 CFR 835 for radon).
5.4 SPECIAL BIOASSAY PROGRAM
Special bioassay should be initiated when off-normal conditions occur or there are indications that
an intake needing assessment may have occurred. Criteria for identifying those conditions typically can
include personal contamination, high air sample results, uncontrolled spread of contamination, or
expressed worker concerns. The response to these conditions is the performance of bioassay
measurements outside the envelope of routinely performed baseline, scheduled periodic, and termination
or ending work measurements. The reason for and interpretation of these special measurements should be
clearly identified. The role of special measurements is to confirm or rule out the initial indication of an
intake, to determine the radiological significance of confirmed intakes, to indicate the need for work
restriction or dose reduction therapy, and to begin the dose assessment process.
Special bioassay measurements may include the same types of measurements as those performed for
routine monitoring (e.g., in vivo measurement, urinalysis) and may also include additional types of
measurements (e.g., fecal analysis, wound counting).
53


Privacy Statement - Press Release - Copyright Information. - Contact Us

Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business