INDIVIDUAL IMPACTOR AND A METHOD FOR ESTIMATING THE COMMITTED EFFECTIVE DOSE OF INTERNAL RADIATION BASED THEREON Russian patent published in 2024 - IPC G01N15/00 G01T1/167 

FIELD: measuring equipment.

SUBSTANCE: group of inventions relates to devices for analyzing the dispersed composition of aerosols entering the human body with inhaled air, and methods for rapid assessment of the committed effective dose (CED) of internal radiation during inhalation intake of radioactive aerosols. Individual impactor consists of a housing with a multi-nozzle cover and a connector for connection of a flow booster and cascade elements arranged in the housing, wherein each of the first three cascade elements consists of a nozzle plate, a separating ring and a collector plate, and a filter is used as the fourth cascade element, wherein the collector plate of the first cascade element is the nozzle plate of the second cascade element, and collector plate of second cascade element is nozzle plate of third cascade element, nozzle plates are flat discs with nozzle holes, uniformly distributed along three concentric circles in the center (second cascade element) or on the periphery on one circle (third cascade element), nozzle holes have a chamfer at angle of 45°, casing cover has rounded edges, inner lower part of casing has conical shape, and bolts are used for connection of cover and casing. Diameter of nozzle holes, thickness of cover and collector plates are selected for volumetric air flow rate of 20 l/min so that on the second cascade element there is deposition of a fraction of particles with an aerodynamic diameter of 10–2.5 mcm, on the third cascade element—with an aerodynamic diameter of 2.5–0.6 mcm, on filter—with aerodynamic diameter of 0.6–0.1 mcm. Method for evaluating CED of internal exposure involves fractional sampling of aerosol, measurement of activity of three fractions of aerosol particles with specified aerodynamic diameters and calculation using dose coefficients from database of dose coefficients of ICRP.

EFFECT: device and method for rapid assessment of internal exposure CED are developed.

4 cl, 6 dwg, 3 tbl