Separation of Rh Isotopes

Twenty procedures used for isolating radioactive Rh isotopes from a variety of irradiated target materials and a review about the chemical properties of Rh which might be useful for separations are given in [123] for a brief survey see [99]. 

Besides K3Rh(N02)e [110, 148, 170, 173] Rh was also precipitated as Rhl3 [23, 110] and as Rh2S3 [159, 186, 190, 192, 200] or coprecipitated with Fe(OH)3 [58, 65, 78, 101, 111]. For separation by extraction tributyl phosphate (TBP) [42], dibutylether [87], and pyridine [127, 178, 199] were used. Ion exchange was applied in [25, 45, 67, 111, 114, 161, 170]. Rh isotopes were also isolated from fission products by a combination of gas jet and gas chromatography [29, 33] and with a mass separator [8]. Rh is preferentially evaporated from a Ru target due to the lower vapor pressure of this element [138]. 

For preparing the counting samples Rh is either precipitated as sulfide or as metal (reducing agent TiCy [123, 152, 173, 178, 182] or plated by electrolysis [23, 111, 123]. 

Example of a separation procedure precipitation, ion exchange [123], see also [110]  

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