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The goal is to set the alarms high enough so that it does not go off during normal operations with shielding in place; but low enough to immediately sound if the shielding is compromised. The JR X-Ray Imaging System Safety Inspection and Radiation Survey Forms provides the procedures for setting and testing the area monitor alarm level.
Figure 6- Active area monitor display (left), high level alarm warning light and port side scintillator (middle), starboard scintillator (right).
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With continuous running, the CP160 can overheat. The CP160 will shut itself down when the internal tank temperature reaches 55°C. The IMS software continuously monitors the CP160 temperature and displays on the main acquisition screen. If the x-ray source temperature exceeds 45°C the x-rays are shut off and the Cool Down Wait… window (Figure 8) is displayed until the temperature drops below 35°C. Once reaching 35°C the X-ray Start command will be given and acquisition will resume. The user may abort at any time by clicking the ABORT button.
Figure 8- Cool Down Wait window. This window will appear if the IMS software detects an x-ray source temperature of 45 degrees C or higher.
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Figure 12- XMSL Parameters Window
Figure 13- Position of detector center from the track's home switch
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- The motion control pusher will move until the section breaks the top of core switch beam.
- The x-ray source will ramp up and a window with the x-ray source status will appear (Figure 16). Once the mA and kV are stable, the window will close and image acquisition will begin. The user may abort at any time by clicking the Abort button.
- Once the top of core is located, the pusher will automatically move the section to the proper location over the detector and begin imaging. The user interface will have a display as shown in Figure 17.
- The system will automatically take images along the section until the actuator reaches its limit switch, at which time it will return to the home position and the source will ramp down.
Figure 16- X-ray Status Window (left). As the source ramps up, the measured values will update. X-ray system not ready window (right). If the source is not ready to ramp up this window will be displayed. Normally, this indicates that a door is open. If the doors are not open, look at the values in the status displays and refer to the vendor’s manual to determine the issue. As soon as the issue is cleared, this window will close and the x-ray start process will resume.
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The offset and gain correction are applied to the raw image according to this formula:
DARK IMAGE
The DARK image is normally made with the x-rays off to capture the electrical background noise of the detector. Material used in the detector’s construction causes a grid to imprint on the images (Figure 22); therefore, it is necessary to take the dark image with the x-rays on at minimal level to capture the imprint.
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