The effectiveness of CaDTPA and ZnDTPA in removing <tex-math>${}^{242}{\rm Cm}$</tex-math> from the rat was compared as a function of the amount of chelate and the time interval between <tex-math>${}^{242}{\rm Cm}$</tex-math> injection and treatment by a single injection of DTPA. CaDTPA was superior to ZnDTPA during early treatment, but there was virtually no difference in effectiveness when the treatment was delayed. The response of <tex-math>${}^{242}{\rm Cm}$</tex-math> to chelate therapy was similar to that reported previously with241 Am.

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