Application of microdosimetric methods for the determination of energy deposition distributions by inhaled actinides
I. Aubineau-Laniece, G. Castellan, R.S. Caswell, F. Guézingar, M.H. Hengé-Napoli, W.B. Li and P. Pihet
Radiat. Prot. Dosim. 1998, 79(1-4), pp 395-400
The respiratory tract dosimetry model of ICRP Publication 66 takes into account the morphometry of lung tissues for the determination of average energy deposited by a emitters. However, it assumes a uniform distribution of radioactive material. The statistical fluctuations in frequency of cells hit and of energy deposited in individual target cells depends significantly on the real distribution of radioactive material, including possible high local concentrations. This paper is aimed at investigating the application of two established analytic methods, which have been combined to determine single and multi-event energy deposition distributions in epithelial cells of bronchiolar airway exposed to 5.15 MeV a particles (239Pu). The relative importance of multi-event occurrence on the shape of the specific energy distributions is discussed.