Abstract
The additional scintillation intensity generated as a result of annihilation radiation causes the pulse height spec18 + trum of Fluorine (635 Key max) to be broader than might be expected in comparison with 36Chlorinc (714 Key nax) The spectrum due only to the annihilation radiation was compared to the complete 18Fluorine spectrum using an aluminum absorber. Measurements made with and without this absorber indicated that the annihilation radiation alone may be detected with an efficiency of approximately 24% compared to that without the absorber. The logarithmic response of the detection system was calibrated in terms of energy to facilitate spectral comparisons.
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