Abstract
A new type lung monitor capable of estimating the distribution of activity in the lungs was developed in order to make correction for the variation in the counting efficiency resulting from the difference of the activity distribution and from the transfer of activity to other organs. The deposition area of activity is roughly estimated by means of image divide counting method. The designed detector consists of a single NaI(Tl)-crystal of 9.5 in. diameter by 0.5 in. thick and seven 3 in. diameter phototubes. The minimum distinguishable amount, defined for localized distribution, is of order of 0.16 nCi 241Am for a 60 min counting period.
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