Apparatus for ascertaining and/or regulating the amounts of radiation in the making of X-ray images
AssigneeAgfa-Gevaert
InventorsRolf Eickel, Dieter Tolksdorf
Life of this patent
Estimating the term…
Abstract
A dosimeter for use in mammographs wherein a plate-like body of electrically non-conductive hard foamed material generates charge carriers in response to exposure to radiation. The body is provided with electrodes which are connected with an energy source. The output signal of the dosimeter is used to regulate the amounts of radiation to which an object is exposed. The entire dosimeter can be installed between the source of radiation and X-ray film or another carrier of images of objects because the dosimeter does not cast a shadow on the film when the object is exposed to radiation.
Claims15
In a dosimeter for X or gamma radiation, a pair of electrodes;
- a body of foamed material which is electrically non-conductive and generates charge carriers on exposure to said radiation situated intermediate and being in electrically conductive contact with said electrodes;
- and means for deriving from said electrodes electric current proportionate to the amount of radiation to which said body has been exposed, including a source of electric potential having terminals of opposite polarities respectively electrically connected to said electrodes.
In an arrangement for making X-ray images on a carrier, a source of X or gamma radiation directed toward the carrier;
- and a dosimeter interposed between said source and the carrier and including a pair of electrodes, a body of foamed material which is electrically non-conductive and generates charge carriers on exposure to said radiation situated intermediate and being in electrically conductive contact with said electrodes, and means for deriving from said electrodes electric current proportionate to the amount of radiation to which said body has been exposed, including a source of electric potential having terminals of opposite polarities respectively electrically connected to said electrodes.
In a mammograph, the combination of means for supporting a record carrier;
- a source of X or gamma radiation directed toward the record carrier;
- and a dosimeter interposed between said source and the record carrier and including a pair of electrodes, a body of foamed material which is electrically nonconductive and generates charge carriers on exposure to said radiation situated intermediate and being in electrically conductive contact with said electrodes, and means for deriving from said electrodes electric current proportionate to the amount of radiation to which said body has been exposed, including a source of electric potential having terminals of opposite polarities respectively electrically connected to said electrodes.
Dependencies are inferred from the claim text.