A Detector of Adjustable Response for the Study of Lung Clearance

Publisher Website
Google Scholar
Abstract
A system of four 5fi × 5 in. cylindrical NaI (TI) is proposed for the study of regional deposition and lung clearance of inhaled gamma-emitting aerosol contaminants. Each of the four detectors is coupled to a collimation system of rectangular opening to achieve uniformity in response across the lung volume. The uniformity in response can be adjusted to any required degree for the different gamma-ray energies by displacement of the detectors relative to the fixed collimation system. The parameters of the system are optimized by a computational study based on the theoretical evaluation of detection efficiency and response. The measured response of the system for a 137Cs point source at different positions of the assumed lung model is presented. The detection limits of the system with lead collimators of 4 cm wall thickness range from 6 to 17 nCi depending on photon energy and can be improved by additional shielding.

This publication has 0 references indexed in Scilit: