COLLIMATOR FOR MANUFACTURING STANDARD ROD FOR NUCLEAR FUEL GAMMA SCANNING SYSTEM AND ITS MANUFACTURING METHOD

摘要

A method to manufacture a collimator to manufacture a standard rod to test nuclear fuel gamma scanning system comprising: (a) connecting a test standard source to an up-and-down jig which has a predetermined clearance off a measuring unit of a detector; (b) placing a collimator between the detector and the test standard source; (c) moving the test standard source upward or downward such that the test standard source is flushed with a height of any one of the two or more standard sources installed in a standard rod for manufacturing; (d) estimating a specification of a slit which is formed in the collimator; and (e) forming the slit in the collimator as per estimated slit specification. Meanwhile the collimator to manufacture a standard rod to test nuclear fuel gamma scanning system is installed between the up-and-down jig which has and moves up-and-down the test standard source; and the measuring unit of the detector which detects, having the predetermined clearance off the up-and-down jig, the radioactivity radiated from the test standard source installed in the up-and-down jig including the slit which collimates the radioactivity radiated from the test standard source straight through the measuring unit of the detector, with the test standard source being flush with the height of the standard source installed in the standard rod for manufacturing.