Waste and Cleanup Risk Assessment
Dose Compliance Concentrations for Radionuclides in Buildings (BDCC)
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BDCC What's New
The What's New section keeps users informed of toxicity value changes, exposure parameter changes, chemical-specific parameter changes, and any equation format changes. Please check this site frequently to be advised of any recent changes.
- The +D and +E isotopes have been removed from the selection list. Now, a user may select the 'Assume secular equilibrium' to see PRG output for the entire chain.
- New inhalation Risk and Dose Coefficients are avilable for Rn-222, Rn-220, Bi-212, Bi-214, Pb-212, Pb-214, and Po-218.
- New dose coefficients (DCFs) have been programmed that were derived following FGR 12 and 13 using the updated isotope list from ICRP 107. DCFs used are provided by the Center for Radiation Protection Knowledge. The main report is Calculations of Slope Factors and Dose Coefficients and the tables of DCFs are in a separate appendix.
- A forward dose assessment option was added to the calulator page. By selecting this option the user is asked for media concentrations and the dose is returned using BDCC equation inputs.
- The radionuclide decay chains, provided in the calculator output, have been updated to reflect new decay information provided in ICRP 107. In addition to tabular results, a visual diagram is provided depicting the branching fractions.
- Updated FSURF values were added that account for multiple source depths (ground plane, 1cm, 5cm, 15cm and infinite depth) and multiple building materials (wood, glass, concrete, drywall and adobe mud brick were analyzed as well as 2 composite scenarios). Composite 1 is a drywall room with a glass window, wooden doors and drywall walls. The floors for composite 1 are concrete and the ceiling is drywall. Composite 2 is a concrete room with wooden doors, a drywall ceiling and a concrete floor. Both composite cases used a homogeneous mix of material for the walls to represent the window and door mixed in with the wall. Finklea 2015 presents the analysis. See Section 4.3.10 of the User Guide for more details.
- This calculator follows the recommendations in the OSWER Directive concerning use of exposure parameters from the 2011 Exposure Factors Handbook.
New generic tables are now available that address the issues listed in the previous entry.
Many updates were performed to establish consistency with other calculators. These updates are mainly in appearance and in functionality. Area Correction Factor defaults have changed slightly and new generic tables will be available soon.