コンプトン散乱を利用した距離測定

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  • Distance Measurement Based on Compton Scattering.

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A distance measurement method to make use of Compton scattering of gamma-ray was proposed. This method treated two cases. Concretely, the case that density of a measured object was constant and the case that the density was changed were examined.<BR>A source and a detector are set up at the same side of the object. When density is not varied, the amount of scattered gamma-ray is not depending on a distance. However, the number of gamma-rays detected becomes a function of distance. The function is in proportion to the solid angle to the detector from the efficient center of a scattering region. On the other hand, in the case that density is changed, the number of scattered gamma-rays is altered by density. Hence the number becomes a function of distance and density. Dual detectors are located at different positions and we make two equations on relation of detected gamma-rays, distance and density. Here if the count of gamma-rays detected is given, both distance and density can be calculated.<BR>By using computer simulations and experiments, a performance of the method was evaluated. As a result, the precision of the distance measurement was ±3% within a range of 10-100 cm in constant density. In the case that the density is changed with a range 1.707-1.885 g/cm3, the accuracy of this method was ±1 mm within a range of 8-10 cm.

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