Particulars of scanning an underlying surface using a pilotless dosimetric complex |
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Authors: | A P Elokhin M V Zhilina P A Parkhoma |
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Affiliation: | 1.Science-Technology Center for Nuclear and Radiation Safety (NTTs YaRB),Moscow,Russia;2.Moscow Engineering Physics Institute (MIFI),Moscow,Russia |
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Abstract: | A method of determining the surface activity of radioactive aerosols along the track of a radioactive cloud, due to a radiological
accident, with the aid of a pilotless dosimetric complex is examined. The optimal flight altitude and the effective scan area
on the underlying surface are determined. To determine the flight altitude, the altitude distribution of the dose rate is
calculated for different photon energy taking account of the reflection of γ rays from the underlying surface by means of
the Monte Carlo method and an analytical relation which takes account of the accumulation factor in the form of Berger’s relation.
The calculations showed a substantial difference between the distributions, which required the introduction of a corrective
function ψ(E
i
) that does not depend on the scan altitude and makes it possible to decrease the computational error by analytical methods
to 10% (the Monte Carlo error). The scan altitude hD above the underlying surface at which it best to conduct radiation monitoring is 40–100 m. The radius for evaluating the
effective scan area is found and is given by the relation rb ≈ 3hD. |
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Keywords: | |
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