Fiber optic radiochromic dosimeter probe and method to make the same

A method for fabrication of a fiber optic dosimeter probe, comprising:

• providing a radiochromic radiation sensitive material;
• providing an optical fiber having a core;
• providing a dielectric mirror of a size at least equal to a size of said core of said optical fiber;
• depositing and attaching said radiochromic radiation sensitive material on a tip of said optical fiber, between said optical fiber and said dielectric mirror to form an assembled probe, said radiochromic radiation sensitive material having a thickness corresponding to a predetermined sensitivity to radiation;
• wherein said dielectric mirror and said optical fiber have a near water equivalent interaction with radiation and are MR compatible.

A method for fabrication of a capillary fiber optic dosimeter probe, comprising:

• providing a radiochromic radiation sensitive material, said radiochromic radiation sensitive material having a thickness corresponding to a predetermined sensitivity to radiation;
• providing an optical fiber having a core;
• providing a second optical fiber;
• providing a biocompatible capillary having a near water equivalent interaction with radiation, said biocompatible capillary having an insertion hole;
• inserting said optical fiber within said capillary from one end;
• inserting said second optical fiber within said capillary form another end;
• aligning said insertion hole between said optical fiber and said second optical fiber;
• inserting said radiation sensitive material between said optical fiber and said second optical fiber through said insertion hole, using an adhesive material to affix said radiation sensitive material to said optical fiber and said second optical fiber;
• wherein said optical fiber and said second optical fiber have a near water equivalent interaction with radiation and are MR compatible.

A fiber optic dosimeter probe for sensing radiation dose comprising:

• an optical fiber having a free end and a sensitive end;
• a window having a sensitive side and a rear side;
• a radiation sensitive layer between said sensitive end of said optical fiber and a sensitive side of said window, said radiation sensitive layer being made of a material having an optical property that changes with absorbed radiation dose, an amount of said material corresponding to a predetermined sensitivity to radiation;
• an adhesive to assemble the window to the optical fiber provided with the radiation sensitive material;
• wherein said window and said optical fiber have a near water equivalent interaction with radiation and are MR compatible and said adhesive has a near water equivalent interaction with radiation.

A fiber optic dosimeter probe for sensing radiation dose comprising:

• an optical fiber having a free end and a sensitive end;
• a window having a sensitive side and a rear side;
• a radiation sensitive layer between said sensitive end of said optical fiber and a sensitive side of said window, said radiation sensitive layer being made of a material having an optical property that changes with absorbed radiation dose, an amount of said material corresponding to a predetermined sensitivity to radiation;
• a fiducial including a metallic band with a Z number higher than a Z number of water and a Z number of said probe, said fiducial being positioned away from said radiation sensitive layer;
• wherein said window and said optical fiber have a near water equivalent interaction with radiation and are MR compatible.