Abstract: A reusable shielded marker for nuclear medicine imaging provides a chamber of radiation-shielding material such as lead to receive the radiodnuclide such as technetium pertechnetate. The chamber is mounted on a spring which also bears a shutter provided with an aperture. When force is applied against the bias of the spring, the aperture and the shutter is brought into alignment with the chamber permitting the radionuclide to emit radiation so as to briefly mark the image to be prepared. When the force is released, the spring biases the shutter out of alignment, such that the radiation-shielding material of the shutter blocks the chamber and shields the user and patient from the emission of radiation. The device may be stored, and reused, with radionuclide being replaced in the chamber as necessary.