System and method for the identification of radiation in contaminated rooms
Devices and methods for the characterization of areas of radiation in contaminated rooms are provided. One such device is a collimator with a collimator shield for reducing noise when measuring radiation. A position determination system is provided that may be used for obtaining position and orientation information of the detector in the contaminated room. A radiation analysis method is included that is capable of determining the amount of radiation intensity present at known locations within the contaminated room. Also, a visual illustration system is provided that may project images onto the physical objects, which may be walls, of the contaminated room in order to identify the location of radioactive materials for decontamination.
1. A collimator, comprising:
a detector;
a collimator shield surrounding the detector that has a plurality of apertures through the collimator shield; and
a directional shield carried by the collimator shield, wherein the directional shield at least partially defines a field of view that functions to prevent some amount of radiation outside of the field of view from a radiation source from moving through the collimator shield to the detector, wherein the field of view is symmetrical about an axis and is conical in shape and extends at an angle of up to 48° from an origin of the conical field of view.
2. The collimator as set forth in claim 1 , wherein the directional shield is located at one of the apertures of the collimator shield and prevents radiation from the radiation source from outside the field of view from moving through the aperture at which the directional shield is located.
3. The collimator as set forth in claim 1 , wherein the directional shield has a base that engages an outer surface of the collimator shield, wherein the directional shield has an upper portion that extends from the base in a direction away from the outer surface of the collimator shield, wherein the upper portion has a concave outer surface.
4. The collimator as set forth in claim 3 , wherein the directional shield has an aperture located along an axis such that the upper portion and the base are symmetric about the aperture with respect to the axis, wherein the aperture of the directional shield is in the shape of a truncated cone having a larger end located at a top of the directional shield.
5. The collimator as set forth in claim 4 , wherein the base is in the shape of a truncated cone that has a concave lower surface that engages the outer surface of the collimator shield, wherein a larger end of the base is contiguous with the upper portion.
6. The collimator as set forth in claim 1 , wherein the directional shield has a stem that is cylindrical in shape and is located in one of the apertures of the collimator shield, wherein an aperture that is cylindrical in shape extends completely through the stem such that both the aperture through the stem and the stem are symmetrical about an axis of the directional shield.
7. The collimator as set forth in claim 1 , wherein the field of view is conical in shape, wherein the directional shield and the collimator shield are made of the same material, and wherein the detector is a radiosensitive detector material in the shape of a sphere, and wherein the directional shield and the collimator shield are integrally formed with one another.
8. The collimator as in claim 1 , wherein the collimator shield has an outer surface, and wherein the directional shield engages the collimator shield and wherein at least a portion of the directional shield is located above the outer surface of the collimator shield.
9. The collimator as set forth in claim 1 , wherein the collimator shield has an inner surface and wherein the detector is closer to the inner surface of the collimator shield than to the outer surface of the collimator shield.
10. The collimator as set forth in claim 1 , wherein the field of view is symmetrical about an axis, and wherein radiation from a radiation source that is outside the field of view is prevented from being detected by the detector.
11. The collimator as set forth in claim 1 , wherein the directional shield and the collimator shield are made of the same material, and wherein the directional shield and the collimator shield are integrally formed with one another.