Abstract
A method is being developed for assessing intakes by inhalation of insoluble thorium by measurement of thoron ( 220 Rn) in exhaled air. It has been shown that it is possible to collect the short-lived decay products of thoron, 216 Po and 212 Pb, electrostatically. The subsequent counting is done using a silicon surface barrier detector, which gives a high detection efficiency and good energy resolution. Experiments have been carried out using a calibrated thoron source to determine the effects of parameters such as flow rate, applied collection voltage and humidity on the collection efficiency of thoron daughters. The estimated minimum detectable activity of the prototype system for lung thorium activity is between 1 and 10 Bq for a 45 min exhaled air collection period
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