Optical system for use with fluoroglass dosimeters

Claim 1

A FLUOROGLASS DOSIMETER COMPRISING A SOURCE OF ULTRAVIOLET LIGHT, A FIRST STOP DISPOSED AT A FOCUS OF A LENS SYSTEM FOR CONDENSING THE LIGHT FROM SAID ULTRA-VIOLET LIGHT SOURCE, A LENS SYSTEM FOR MAGNIFYING AND MAKING CONVERGENT RAYS BY REFRACTING THE LIGHT HAVING PASSED THROUGH SAID FIRST STOP, A BLOCK OF DOSIMETER GLASS IN THE FORM OF A RECTANGULAR PARALLELEPIPED DISPOSED IN AN OPTICAL PATH OF SAID MAGNIFYING LENS SYSTEM, A SECOND STOP DISPOSED IN FRONT OF SAID GLASS OF RECTANGULAR PARALLELEPIPED FOR INTERCEPTING THE INCIDENT LIGHT UPON PERIPHERAL EDGES OF A FACE OF SAID RECTANGULAR PARALLELEPIPED THEREBY NEARLY PARALLEL RAYS BEING OBTAINED, A MIRROR FACE DISPOSED BEHIND SAID GLASS OF RECTANGULAR PARALLELEPIPED FOR REFLECTING THE LIGHT HAVING PASSED THROUGH SAID SECOND STOP, REFLECTIVE MIRRORS FOR DIVERTING OUTWARDLY OF THE OPTICAL PATH A PORTION OF STRAY LIGHT INCLUDED IN THE LIGHT HAVING PASSED THROUGH SAID SECOND STOP, A PHOTOMULTIPLIER POSITIONED OUT OF THE PATH OF LIGHT FROM SAID LAST MENTIONED REFLECTIVE MIRRORS FOR RECEIVING FLUORESCENCE EMITTED IN SAID GLASS OF RECTANGULAR PARALLELEPIPED, AND AN INSTRUMENT FOR MEASURING A PHOTOELECTRIC CURRENT OUTPUT OF SAID PHOTOMULTIPLIER.