Occupational Intakes of Radionuclides Part 1 - ICRP
Occupational Intakes of Radionuclides Part 1 - ICRP
Occupational Intakes of Radionuclides Part 1 - ICRP
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DRAFT REPORT FOR CONSULTATION<br />
Worker<br />
In this text any person who works, whether full time, part time or temporarily,<br />
for an employer and who has recognised rights and duties in relation to<br />
occupational radiation protection (<strong>ICRP</strong>, 2007).<br />
Terms for the biokinetic models<br />
Absorption<br />
Transfer <strong>of</strong> material to body fluids regardless <strong>of</strong> mechanism. Generally applies<br />
to dissociation <strong>of</strong> particles and the uptake into body fluids <strong>of</strong> soluble<br />
substances and material dissociated from particles.<br />
Aerodynamic diameter (dae)<br />
Diameter (μm) <strong>of</strong> a unit density (1 g cm -3 ) sphere that has same terminal<br />
settling velocity in air as the particle <strong>of</strong> interest.<br />
Alimentary tract<br />
The tube from mouth to anus in which food is digested.<br />
Alimentary tract transfer factor (fA)<br />
The fraction <strong>of</strong> activity entering the alimentary tract that is absorbed to blood,<br />
taking no account <strong>of</strong> losses due to radioactive decay or endogenous input <strong>of</strong><br />
activity into the tract.<br />
Alveolar-Interstitial Region (AI)<br />
<strong>Part</strong> <strong>of</strong> the respiratory tract, consisting <strong>of</strong> the respiratory bronchioles, alveolar<br />
ducts and sacs with their alveoli, and the interstitial connective tissue; airway<br />
generations 16 and beyond.<br />
AMAD<br />
Activity Median Aerodynamic Diameter. Fifty percent <strong>of</strong> the activity in the<br />
aerosol is associated with particles <strong>of</strong> aerodynamic diameter (dae) greater than<br />
the AMAD. Used when deposition depends principally on inertial impaction<br />
and sedimentation, typically when the AMAD is greater than about 0.5 μm.<br />
AMTD<br />
Activity Median Thermodynamic Diameter. Fifty percent <strong>of</strong> the activity in the<br />
aerosol is associated with particles <strong>of</strong> thermodynamic diameter (dth) greater<br />
than the AMTD. Used when deposition depends principally on diffusion,<br />
typically when the AMAD is less than about 0.5 μm.<br />
Basal cells<br />
Cuboidal epithelial cells attached to the basement membrane <strong>of</strong> extrathoracic<br />
and bronchial epithelium and not extending to the surface.<br />
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