Abstract
Individual ultraviolet (uv) photons are counted after passage through irradiated and unirradiated ferrous sulfate solution to determine the optical density of the irradiated solution. The lower limit of optical density that may be easily read by the spectrophotometer is approximately 0.15 whereas the lowest optical density that may be read by direct photon counting is approximately 0.0043. Direct photon counting is utilized to extend the lower limit of absorbed dose necessary for ferrous sulfate dosimetry by a factor of approximately 30-35 or from 4000 to 120 rads. The reading of the optical density of the irradiated ferrous sulfate solution by direct photon counting is shown to give the same results as the reading by a spectrophotometer within the limits of the spectrophotometer. At the small optical densities as considered here, experimental random errors may be much larger than the calculated or statistical error and actually determine the lower limit in the measuring range of the method.
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