Abstract
A unique projection chest phantom has been constructed of very inexpensive materials. This phantom provides for complete variability of chest thickness and incorporates bone structures of a bone-equivalent substance. The phantom contains lung cavities in which doped artificial lungs can simulate any possible lung deposition. The phantom is designed to be especially useful for calibration of in vivo lung counters when measuring low-energy x-rays and gamma rays (10 to 100 keV). Construction details and a comparison of results with those obtained using a commercial phantom show a reasonable relationship and demonstrate the usefulness of the projection concept.