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X-ray detection conditions
The detection shall be carried out under the conditions that the limiting device of the X-ray flaw detection device is opened to the maximum, and the rated tube voltage and the tube current are irradiated.
X-ray inspection room inspection and inspection
Detection of radiation levels around the inspection room
The radiation protection test of the inspection room, especially the acceptance test, should first conduct a patrol measurement of the surrounding radiation level to find possible high radiation level areas. The following requirements should be noted:
(1) The scope of the survey should be determined according to the design characteristics of the inspection room, the direction of illumination and possible problems during construction, and pay attention to the influence of sky backscatter on the surrounding radiation.
(2) The inspection room without fixed illumination direction should patrol the different positions on the wall and the radiation level around the door and door when the four-sided shielding wall is illuminated by the useful wire harness.
(3) The inspection room with windows shall pay special attention to the radiation levels at different distances outside the inspection window;
(4) During the test, the flaw detector shall work under the rated working conditions, no flaw detection of the workpiece, and the flaw detector shall be placed in the nearest position possible with the test point. If the circumferential flaw detector is used, the device shall be in the circumferential illumination state.
Fixed point detection
(1) A position where the level of radiation found is abnormally high by patrolling;
(2) The height of the inspection room is 30cm away from the ground at a height of 1m, and the left and right sides of the door are at 3 points and around the door joint;
(3) Outside the wall of the inspection room or the roof of the adjacent room inspection room or 30cm outside the upper part of the inspection room, including at least 5 detection points of the main beam arrival range
(4) After each flaw detection, the population of the inspection room should be tested to ensure that the X-ray flaw detector has stopped working. (责任编辑：admin) |
