Feasibility study and prototype design of a NaI gamma-ray densitometer for use in LOFT
The performance of a gamma-ray densitometer system using computer modeling techniques is predicted. The system studied consists of a /sup 60/Co calibration source, a pipe containing a variable amount of water absorber where the water contains radioactive /sup 16/N, and a shielded and collimated NaI detector system. The basic question is: Can one detect the change in signal from the collimated /sup 60/Co calibration source caused by a water density change when the detector system is subject to an adjacent background source equivalent to about 30 Ci of high energy (avg. 6 MeV, pk. 10 MeV) gamma rays. The first report indicated that excessive (saturation) detector count rates could easily occur from this high energy, high intensity background and the second basic question is: How much lead shielding is required for typical NaI detectors to keep the detector count rate from this source below 50 kcps (50,000 counts per second). The importance of this question is borne out by the results that indicate that the weight of lead shielding required is about 1000 lbs.
- Research Organization:
- California Univ., Livermore (USA). Lawrence Livermore Lab.
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 7227160
- Report Number(s):
- UCID-17365
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
220600* -- Nuclear Reactor Technology-- Research
Test & Experimental Reactors
440101 -- Radiation Instrumentation-- General Detectors or Monitors & Radiometric Instruments
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
DENSITOMETERS
DESIGN
LOFT REACTOR
MEASURING INSTRUMENTS
PERFORMANCE TESTING
PHOTOMETERS
PWR TYPE REACTORS
RADIATION DETECTORS
REACTORS
RESEARCH AND TEST REACTORS
SCINTILLATION COUNTERS
SOLID SCINTILLATION DETECTORS
TANK TYPE REACTORS
TEST REACTORS
TESTING
WATER COOLED REACTORS
WATER MODERATED REACTORS
220600* -- Nuclear Reactor Technology-- Research
Test & Experimental Reactors
440101 -- Radiation Instrumentation-- General Detectors or Monitors & Radiometric Instruments
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
DENSITOMETERS
DESIGN
LOFT REACTOR
MEASURING INSTRUMENTS
PERFORMANCE TESTING
PHOTOMETERS
PWR TYPE REACTORS
RADIATION DETECTORS
REACTORS
RESEARCH AND TEST REACTORS
SCINTILLATION COUNTERS
SOLID SCINTILLATION DETECTORS
TANK TYPE REACTORS
TEST REACTORS
TESTING
WATER COOLED REACTORS
WATER MODERATED REACTORS