公开(公告)号：US3864568A

公开(公告)日：1975-02-04

申请号：US26423072

申请日：1972-06-19

Applicant: SHM NUCLEAR

Inventor： HELGESSON A

IPC: G01T1/29 ,  G01N23/00

CPC classification number: G01T1/2964

Abstract: 1. ISODOSE PLOTTING APPARATUS FOR PLOTTING PENETRATION TYPE RADIATION MEASUREMENTS COMPRISING: PHANTOM MEANS AT WHICH A RADIATION SOURCE IS DIRECTED AND IN WHICH RADIATION MEASUREMENTS ARE TAKEN, DETECTION MEANS FOR TAKING RADIATION INTENSITY MEASUREMENTS IN SAID PHANTOM MEANS, SAID DETECTION MEANS HAVING A MOVABLE DETECTOR MEANS WHICH GENERATES SIGNALS FOR MEASURING DIRECT RADIATION INTENSITY, DRIVE MEANS HAVING A PLURALITY OF DRIVE AXES FOR MOVING SAID DETECTOR MEANS IN SAID PHANTOM MEANS, CONTROL MEANS HAVING A VELOCITY CONTROL AND A SERVO CONTROL RESPONSIVE TO SIGNALS FROM SAID DETECTORS MEANS FOR MOVING SAID DETECTOR MEANS UNDER VELOCITY CONTROL ON A FIRST DRIVE AXIS AND UNDER SERVO CONTROL ON A SECOND DRIVE AXIS ALONG A PATH REPRESENTATVE OF A PREDETERMINED DOSAGE WITHIN SAID PHANTOM MEANS, SENSING MEANS FOR SENSING THAT A PREDETERMINED DISTANCE OF MOVEMENT OF SAID DETECTOR ON AN AXIS UNDER SERVO CONTROL HAS OCCURRED RELATIVE TO A PREDETERMINED DISTANCE OF MOVEMENT OF AN AXIS UNDER VELOCITY CONTROL, AND SWITCHING MEANS RESPONSIVE TO SAID SENSING MEANS FOR AUTOMATICALLY INTERCHANGING THE DRIVE AXIS UNDER SAID VELOCITY CONTROL AND SAID SERVO CONTROL WHEN A PREDETERMINED DISTANCE OF MOVEMENT OF SAID DETECTOR MEANS ON SAID AXIS UNDER SERVO CONTROL HAS OCCURRED RELATIVE TO A PREDETERMINED DISTANCE OF MOVEMENT ON SAID AXIS UNDER VELOCITY CONTROL.