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- W1990487997 abstract "Using the track-detecting plastic CR-39, we have examined the reaction of trace quantities of neptunium in solution with surfaces of an old fissure of granite rock. Radionuclides that were dissolved in a groundwater solution by leaching of solids that contained a variety of radionuclides were transmitted in flowing water into the rock fissure. The rock fissure was then dried and the rock split at the fissure for analysis by radiochemical and radiographic techniques. Radiochemical analyses have shown neptunium-237 to be the alpha-active nuclide adsorbed on the rock surface. An alpha radiograph of one fissure surface, analysed in detail, indicates that neptunium was adsorbed along the entire length of the rock fissure rather than strongly adsorbed at the inlet to the rock fissure as was another radioelement, cesium (as seen in a beta radiograph). Some inhomogeneities of neptunium concentration were observed on the fissure surface. They may be indicative of local mineralogical variation of the rock, which can affect adsorption of neptunium. Quantification of the alpha activity on the fissure surface by track counting on plastic and by radiochemical separation and electronic counting established that virtually all of the 237Np on the rock fissure was detectable by the CR-39 plastic. This indicates that the neptunium was on the surface of the rock fissure and did not penetrate deeply into the rock surface." @default.
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- W1990487997 date "1983-01-01" @default.
- W1990487997 modified "2023-09-28" @default.
- W1990487997 title "Distribution of alpha activity from neptunium on rock fissures" @default.
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- W1990487997 doi "https://doi.org/10.1016/0735-245x(83)90025-x" @default.
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