Ammonium pertechnetate is a chemical compound with the formula NH4TcO4.

It is the ammonium salt of pertechnetic acid.

The most common form uses 99Tc.

[1] The compound is readily soluble in aqueous solutions forming ammonium and pertechnetate ions.

It can be synthesized by the reaction of pertechnetic acid and ammonium nitrate: It thermally decomposes under inert atmosphere at 700 °C to technetium dioxide: Passing hydrogen sulfide through acidic solutions of ammomium pertechnetate produces Technetium(VII) sulfide:[2][3][4]