2009 Status Report: Advances in Inhalation Dosimetry of Gases and Vapors with Portal of Entry Effects in the Upper Respiratory Tract
Notice The U.S. EPA has released the final status report entitled Advances in Inhalation Dosimetry of Gases and Vapors with Portal of Entry Effects in the Upper Respiratory Tract.
This report reviews advances in the state of the science for inhalation gas dosimetry related to the URT or nasal tract region that have occurred since the publication of the Methods for Derivation of Inhalation Reference Concentrations and Application of Inhalation Dosimetry; EPA/600/8-90/066F, October 1994 (RfC Methods). The RfC Methods document provides the basis for EPA extrapolation of data from animal toxicology studies to estimate delivered dose in humans as part of the development of inhalation reference values (i.e., RfC values).The primary results from this review include empirical information related to the assumptions underlying the current methodology used by EPA, as well as how the state of the science and advanced dosimetry modeling techniques inform these assumptions. The intent of this report is to serve as a source document for revisions to the Agency’s RfC Methods. The report makes clear that it is intended neither to displace the current procedures for gas dosimetry in RfC Methods nor to reflect on use of these procedures in assessments currently in IRIS.
|Jun 2009||Internal EPA workgroup review and management review.|
|Jul 2009||Revised report submitted to independent, external peer review.|
|Aug 2009||Revised final report based on peer review comments.|
|Sep 2009||EPA released the final report.|
This download(s) is distributed solely for the purpose of pre-dissemination peer review under applicable information quality guidelines. It has not been formally disseminated by EPA. It does not represent and should not be construed to represent any Agency determination or policy.
- (100 pp, 897 KB, about PDF)
- Methods for Derivation of Inhalation Reference Concentrations (RfCs) and Application of Inhalation Dosimetry
- 2011 Status Report: Advances in Inhalation Dosimetry for Gases with Lower Respiratory Tract and Systemic Effects
- Advances in Inhalation Gas Dosimetry for Derivation of a Reference Concentration (RfC) and Use in Risk Assessment