Use of probability analysis to establish routine bioassay screening levels
Probability analysis was used by the Hanford Internal Dosimetry Program to establish bioassay screening levels for tritium and uranium in urine. Background environmental levels of these two radionuclides are generally detectable by the highly sensitive urine analysis procedures routinely used at Hanford. Establishing screening levels requires balancing the impact of false detection with the consequence of potentially undetectable occupation dose. To establish the screening levels, tritium and uranium analyses were performed on urine samples collected from workers exposed only to environmental sources. All samples were collected at home using a simulated 12-hour protocol for tritium and a simulated 24-hour collection protocol for uranium. Results of the analyses of these samples were ranked according to tritium concentration or total sample uranium. The cumulative percentile was calculated and plotted using log-probability coordinates. Geometric means and screening levels corresponding to various percentiles were estimated by graphical interpolation and standard calculations. The potentially annual internal dose associated with a screening level was calculated. Screening levels were selected corresponding to the 99.9 percentile, implying that, on the average, 1 out of 1000 samples collected from an unexposed worker population would be expected to exceed the screening level. 4 refs., 2 figs.
- Research Organization:
- Pacific Northwest Lab., Richland, WA (USA)
- Sponsoring Organization:
- DOE/NE
- DOE Contract Number:
- AC06-76RL01830
- OSTI ID:
- 6267819
- Report Number(s):
- PNL-SA-17716; CONF-9010219-4; ON: DE91002812; TRN: 91-001705
- Resource Relation:
- Conference: 36. annual conference on bioassay, analytical, and environmental radiochemistry, Oak Ridge, TN (USA), 22-26 Oct 1990
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
HANFORD RESERVATION
PERSONNEL
OCCUPATIONAL EXPOSURE
TRITIUM
BIOASSAY
URANIUM
FFTF REACTOR
PROBABILITY
RADIATION DOSES
SAFETY
SAMPLING
STATISTICAL MECHANICS
URINE
ACTINIDES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BIOLOGICAL MATERIALS
BIOLOGICAL WASTES
BODY FLUIDS
DOSES
ELEMENTS
EPITHERMAL REACTORS
FAST REACTORS
HYDROGEN ISOTOPES
ISOTOPES
LIGHT NUCLEI
LIQUID METAL COOLED REACTORS
MATERIALS
MECHANICS
METALS
NATIONAL ORGANIZATIONS
NUCLEI
ODD-EVEN NUCLEI
RADIOISOTOPES
REACTORS
RESEARCH AND TEST REACTORS
RESEARCH REACTORS
SODIUM COOLED REACTORS
TEST REACTORS
US DOE
US ERDA
US ORGANIZATIONS
WASTES
YEARS LIVING RADIOISOTOPES
054000* - Nuclear Fuels- Health & Safety
990200 - Mathematics & Computers