Quantcast Fixed and Personnel Nuclear Accident Dosimeters - doe-std-1128-98_ch10206

 

Click here to make tpub.com your Home Page

Page Title: Fixed and Personnel Nuclear Accident Dosimeters
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
   
   

 

Share on Google+Share on FacebookShare on LinkedInShare on TwitterShare on DiggShare on Stumble Upon
Back
Initial Screening Evaluation - doe-std-1128-98_ch10205
Up
DOE Standard Guide of Good Practices for Occupational Radiological Protection In Plutonium Facilities
Next
Neutron-Measuring Component of Dosimeter - doe-std-1128-98_ch10207


DOE-STD-1128-98
7.4.2.2
Fixed and Personnel Nuclear Accident Dosimeters
A comprehensive nuclear criticality dosimetry system should consist of
stationary (fixed-location, area) dosimeters, neutron and gamma dosimeters
worn by personnel (i.e., PNADs), and specialized laboratory equipment to
evaluate the dosimeters.
Fixed nuclear accident dosimeter units should be capable of determining
neutron doses in the range of 10 rad to 10,000 rad with an accuracy of
25%. They should also be capable of providing the approximate neutron
spectrum to permit the conversion of rad to rem. The gamma-measuring
component of the dosimeter should be capable of measuring doses in the
range of 10 rem to 10,000 rem in the presence of neutrons with an accuracy
of about 20%. The number of fixed dosimeter units needed and their
placement will depend on the nature of the operation, structural design of
the facility, and accessibility of areas to personnel. Generally, dosimeters
should be placed such that there is as little intervening shielding and as few
obstructions as possible (ANSI, 1969b). The number and placement of
dosimeters should be periodically reverified to reflect changes in building
design and operations. Ease of dosimeter recovery after a criticality event
should be considered in their placement, including the possible need for
remote retrieval.
10 CFR 835.1304 requires that PNADs be worn by all individuals who
enter a controlled area with specified quantities of fissile material. The
PNADs should be capable of determining gamma dose from 10 rad to 1000
rad with an accuracy of 20% and neutron dose from 1 rad to 1000 rad
with an accuracy of 30% without dependence upon fixed-unit data.
ANSI N13.3 (ANSI, 1969b) provides general criteria for nuclear accident
dosimeters that are reviewed below. Dosimeters, both fixed and personnel,
should be protected against radioactive contamination to avoid false
measurements. Periodic inventory methods should be established and
audits made to ensure that the dosimeters are not removed or relocated
without appropriate approvals. Techniques for estimating the effect of body
orientation at the time of the exposure should also be developed.
7-14


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

Integrated Publishing, Inc.