Accession Number : ADD011946

Title :   Radiological Instrument.

Descriptive Note : Patent Application,

Corporate Author : DEPARTMENT OF THE ARMY WASHINGTON DC

Personal Author(s) : Kronenberg,S ; McLaughlin,W L ; Siebentritt,C R , Jr

Report Date : 10 Oct 1985

Pagination or Media Count : 53

Abstract : This patent application discloses a radiological measuring instrument including an angularly variable radiation sensitive structure comprised of two blocks of material having a different index of refraction with one of the materials comprising a radiochromic substance whose refractive index changes through anomolous dispersion as a result of being exposed to radiation. The ratio of the two indices of refraction is selected to be close to unity, with the radiation sensitive structure being pivotally adjusted so that light is directed into one end of the block comprising the material having the greater index of refraction. This element, moreover, is selected to be clear and transparent with the incident angle being close to the critical angle where total reflection of all incident light occurs. A portion of the incident light is furthermore projected through the clear transparent block without reflection, with the two beams emerging from the other end of the block, where they are detected. Exposure to radiation changes the index of refraction of the radiochromic block and accordingly the reflected energy emerging therefrom. Calibrated readjustment of the angle of incidence provides a measure of the sensed radiation.

Descriptors :   *PATENT APPLICATIONS, *RADIATION MEASURING INSTRUMENTS, NS, ANGLE OF INCIDENCE, RADIATION, SENSITIVITY, RADIOLOGY, TRANSPARENCE, EXPOSURE(GENERAL), REFRACTIVE INDEX, RATIOS, STRUCTURAL PROPERTIES, INTERNAL REFLECTION

Subject Categories : Nuclear Instrumentation

Distribution Statement : APPROVED FOR PUBLIC RELEASE