Portable source of radioactivity
阅读：890发布：2023-05-21
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1. A PORTABLE SOURCE OF RADIOACTIVITY COMPRISING A LEAD BODY HAVING SUBSTANTIALLY THE FORM OF A SURFACE GENERATED BY A SEMI-CIRCLE ROTATED ABOUT AN AXIS LYING IN ITS PLANE AND PARALLEL TO BUT SPACED FROM THE FLAT SIDE OF THE SEMICIRCLE THEREBY PROVIDING A CYLINDRICAL HOLE EXTENDING THROUGH THE MIDDLE OF THE BODY, A BRASS HOUSING SURROUNDING SAID BODY PROVIDING A CYLINDRICAL CAVITY THEREIN CONCENTRIC WITH SAID CYLINDRICAL HOLE A CYLINDRICAL TUNGSTEN ROTOR ROTATALY MOUNTED ON ITS AXIS IN THE CAVITY AND COAXIALLY THEREWITH, THE HOUSING AND LEAD BODY BEING PROVIDED WITH A FRUSTO-CONICAL OPENING EXTENDING THERETHROUGH WITH THE SMALLER SECTION OPENING INTO SAID CYLINDRICAL CAVITY AND HAVING ITS AXIS LYING ALONG A LINE WHICH SUBSTANTIALLY BISECTS THE LEAD BODY AT RIGHT ANGLES TO THE AXIS OF SAID CYLINDRICAL CAVITY, THE ROTOR HAVING A CYLINDRICAL HOLE EXTENDING DIAMETRICALLY THERETHROUGH AND COAXIAL WITH SAID FRUSTO-CONICAL OPENING AND HAVING A DIAMETER APPROXIMATELY EQUAL TO THAT OF THE SMALLER END OF SAID OPENING, A SHOULDER ADJACENT ONE END OF SAID HOLE IN THE ROTOR, A CAPSULE CONTAINING THULIUM POSITIONED IN THE HOLE IN THE ROTOR AGAINST SAID SHOULDER, A TUNGSTE ALLOY PLUG SUBSTANTIALLY FILLING THE REMAINDER OF THE HOLE IN THE ROTOR AND RETAINING THE CAPSULE AGAINST SAID SHOULDER, MEANS FOR ROTATING THE ROTOR BETWEEN AN EXPOSED POSITION WHERE THE CAPSULE LIES ADJACENT THE INNER END OF SAID FRUSTO-CONICAL OPENING AND A SHIELDED POSITION 180* AWAY IN WHICH THE OUTER END OF THE TUNGSTEN ALLOY PLUG IS ADJECENT THE INNER END OF SAID FRUSTO-CONICAL OPENING AND PREVENTS RADIATIONS FROM THE CAPSULE FROM EMANATING THROUGH SAID FRUSTOCONICAL OPENING, THE SHAPE OF THE LEAD BODY PROVIDING SUBSTANTIALLY UNIFORM SHIELDING FOR THE CAPSULE IN ALL POSITIONS AND CONTROLLING THE BEAM OF RADIATIONS, WHEN THE CAPSULE IS IN THE EXPOSED POSITION, BY LIMITING IT TO THE SHAPE OF THAT OF THE OPENING.
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