On the Possibility of Determining the Distribution of a Substance Penetrating into a Dense Medium Using Gamma-Ray Detection and Ranging Approach |
| L.L. Gurdeva, T.N. Dreischuha, D.V. Stoyanova and C.N. Protochristovb
aInstitute of Electronics, Bulgarian Academy of Sciences, 72 Tzarigradsko Shosse Blvd., 1784 Sofia, Bulgaria bInstitute of Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, 72 Tzarigradsko Shosse Blvd., 1784 Sofia, Bulgaria |
| Received: May 11, 2010 |
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| The possibility has been investigated of determining, using graydar (Gamma RAY Detection And Ranging) approach, the in-depth partial-density profile of some substance absorbed in a dense medium. Analytical algorithms have been derived for retrieving the in-depth profile of the partial density of the absorbed substance on the basis of the conjecturally known in-depth profile of the extinction of the absorbing medium and the experimentally determinable graydar profile. The retrieval error under the Poisson noise conditions has also been estimated analytically. The simulations performed of the Poisson-noise effect concern the case of soil moisture. The results obtained confirm the validity of the derived retrieval algorithms and error estimates and show that the soil moisture profile may be accurately determined to depths of 50 cm, depending on the dry-soil bulk density, the sensing photon flux, and the measurement time. |
| DOI: 10.12693/APhysPolA.118.540 PACS numbers: 07.85.-m, 81.70.-q, 92.40.Lg, 93.85.Np |