Neptunium equation

Neptunium-237 undergoes an a, p, a, a, p, a, a, a, p, a, p sequence of radioactive decays. Determine the daughter nuclide after each decay and write a balanced nuclear equation for each step. 

Tin and americium were so extensively sorbed under all conditions that isotherm data could not be obtained. These elements are not significantly mobile in the Mabton Interbed aquifer. Values of Freundlich constants for technetium, radium, uranium, neptunium, and plutonium are given in Table IV. The Freundlich equation did not fit the selenium sorption data very well probably because of slow sorption kinetics or precipitation. Precipitation was also observed for technetium at 23°C for concentrations above 10 7M. This is about the same solubility observed for technetium in the sandstone isotherm measurements. Linear isotherms were observed only in the case of radium sorption. In general, sorption on the Mabton Interbed was greater than on the Rattlesnake Ridge sandstone. This is probably due to the greater clay content of the Mabton standard. 

Sorption Prediction Equations. Equations predicting radioelement distribution coefficients, K s, as arithmetic functions of component concentrations were obtained for sorption of strontium, neptunium, plutonium, and americium on two Hanford sediments. These equations, presented in Table VH and derived from statistical fits of Box-Behnken experimental designs, were generated for strontium in terms of sodium ion, HEDTA, and EDTA concentrations. Prediction equations for neptunium and plutonium sorption were derived from NaOH, NaA102, HEDTA, and EDTA concentrations. Americium sorption prediction equations were based on NaOH, HEDTA, and EDTA concentrations. 

As shown in Table VII, the equations modeled the data better for neptunium and plutonium than for strontium and americium. The lack of fit for strontium and americium reflected the strong effect that the increased HEDTA and EDTA concentrations had on decreasing the K. The ranges of Kd s observed for strontium and americium were broader, and more difficult to model, than the ranges observed for neptunium and plutonium. 

Trivalent homoleptic complexes An[N(SiMe3)2]3 have been generated for uranium, neptunium, and plutonium " by metathesis reactions (see Equations (1) and (2)). The molecular structure of U[N(SiMe3)2]3 has been determined ... 

The neptunium adsorption on the resin was calculated from the measurements of 239Np not adsorbed according to the following equation ... 

Because the distribution coefficient in TBP of hexavalent neptunium is higher than tetravalent, the hexavalent form is preferred for the first extraction from fission products. The first part of Table 10.22 gives equations for the concentration ratio of hexavalent to pentavalent neptunium calculated for the three oxidants listed there, with the coefficient evaluated from exp(-38.93 A °). 

Neptunium-237 is the parent nuclide of a decay series that starts with a emission, followed by p emission, and then two more a emissions. Write a balanced nuclear equation for each step. 

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