Technical basis for using nose swab bioassay data for early internal dose assessment.
One of the challenges to the dose assessment team in response to an inhalation incident in the workplace is to provide the occupational physicians, operational radiation protection personnel and line managers with early estimates of radionuclide intakes so that appropriate consequence management and mitigation can be done. For radionuclides such as Pu, where in vivo counting is not adequately sensitive, other techniques such as the measurement of removable radionuclide from the nasal airway passages can be used. At Los Alamos National Laboratory (LANL), nose swabs of the ET1 region have been used routinely as a first response to airborne Pu releases in the workplace, as well as for other radionuclides. This paper presents the results of analysing over 15 years of nose swab data, comparing these with dose assessments performed using the Bayesian methods developed at LANL. The results provide empirical support for using nose swab data for early dose assessments. For Pu, a rule of thumb is a dose factor of 0.8 mSv Bq(-1), assuming a linear relationship between nasal swab activity and committed effective dose equivalent. However, this value is specific to the methods and models used at LANL, and should not be applied directly without considering possible differences in measurement and calculation methods.
Guilmette
Raymond A
RA
Los Alamos National Laboratory, MS G471, RP-2, Los Alamos, NM 87545, USA. rguilmet@lanl.gov
Bertelli
Luiz
L
Miller
Guthrie
G
Little
Tom T
TT
D000465:Algorithms; D001681:Biological Assay / Q000379:methods*; D001822:Body Burden; D003198:Computer Simulation; D006801:Humans; D008954:Models, Biological; D009297:Nasal Mucosa / Q000378:metabolism*; D011829:Radiation Dosage; D011868:Radioisotopes / Q000032:analysis* / Q000493:pharmacokinetics*; D011874:Radiometry / Q000379:methods*; D012062:Relative Biological Effectiveness; D012680:Sensitivity and Specificity
D011868:Radioisotopes