PROMETHIUM-147 RADIOLUMINESCENT DECAY
ARMY MOBILITY EQUIPMENT RESEARCH AND DEVELOPMENT COMMAND FORT BELVOIR VA
Pagination or Media Count:
A radioluminescent paint excited by promethium-147 was applied to 20 test items. The luminous decay was measured from 12 to 18 months after production. A single decay constant is used to fit all samples to an exponential decay curve. The effective luminous half-life is calculated to be 12.6 months contrasted with 30 months for the radionuclide. A comparison of the relative luminosities of three different groups at the time of manufacture and at 15 months reveals that at some time during that period the groups decayed with different decay constants. The two brighter groups differed by 35 percent initially, but at 15 months they differed by less than 5 percent.
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