ON THE ABSORPTIVITY OF A LIMITED VOLUME
OF BLOOD SUBJECTED TO EXTRACORPOREAL
ULTRAVIOLET IRRADIATION

A. B. Gavrilovich

UDC 535.36

A method and results of calculations of the absorptivity of a limited 
volume of blood under the conditions of ultraviolet irradiation 
in extracorporeal-type apparatuses up to practical use in clinics 
are presented. The method is based on an approximate analytical solution 
of the equation of radiation transfer in the 3D geometry for a disperse 
medium that models blood in a chamber for irradiation. For the given 
shape of the chamber with relative dimensions 5x3x1, data on the density 
of multiply scattered ultraviolet radiation formed at each point of the medium 
have been obtained. The spectra of the absorptivity, the values of 
the radiation energy absorbed by the irradiated volume of blood and 
issuing from the medium through the chamber walls, as well as the volumes 
of the zones of effective irradiation of erythrocytes for the whole and 
diluted blood have been calculated.

B. I. Stepanov Institute of Physics, National Academy of Sciences 
of Belarus, 68 Nezavisimost' Ave., Minsk, 220072, Belarus; 
email: gavril@dragon.bas-net.by. Translated from Inzhenerno-Fizicheskii 
Zhurnal, Vol. 81, No. 6, pp. 1170-1177, November-December, 
2008. Original article submitted February 6, 2008.