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. 2020 Sep 29;59(4):683–692. doi: 10.1007/s00411-020-00870-x

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© The Author(s) 2020

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 1 — Schematic view of the box where neutron-activated radioactive ⁵⁶MnO₂ powder was dispersed on experimental animals. 1-Pneumatic tube for dispersion of radioactive ⁵²Mn powder; 2-air filter; 3-plastic wall of the box; 4-plastic floor of the box with holes, where experimental animals were placed; 5-tubes for forced ventilation