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Example text

Turn off power to the NIM bin. 3. Connect the ion chamber to the amplifier. 4. 2. 5. Turn on power to the NIM bin. Adjust the ionization chamber power supply to +200 VDC. 6. 1 to determine the proper length of the delay cable to the CFD. ) 7. Set the zero crossing point using the Zero potentiometer. ) 8. Set the output pulse width of the CFD. ) 9. Generate a pulse height curve to determine the discriminator threshold and set it. 2. 5 DETECTOR SETUP Either a two-detector or four-detector setup is used depending on the measurement.

Calibration of an item, and 4. Comparison and confirmation of an item against calibration database. The first step is performed at the start of each day and prior to making any other measurements. This step is repeated until all detectors are responding within specification. The second step is performed once for each new item/container configuration or when there is concern in step 4 that the item may not be located properly in the container. Once the scan is performed and the proper height to calibrate an item is determined, then a series of calibration measurements (step 3) are performed at this height for future reference.

Click on the OK button. 6. csv 7. Verify that all efficiencies are 63 ± 1 percent: • • If efficiencies are too low, increase the high voltage to the detector. If efficiencies are too high, decrease the high voltage to the detector. 8. 1 MeV. 9. 2. 10. 1 MeV) then record the detector peak efficiencies and neutron thresholds in the logbook. 36 Chapter 5 OVERVIEW OF NMIS MEASUREMENTS The Nuclear Material Identification System (NMIS) is a computer-based correlation system composed of hardware and software components.

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