Fig. 1. Detector configuration of shielded NaI analyzer system.
Table 1. NIST-traceable radium standard sources for instrument efficiency calibration.
Fig. 2. Ra226 efficiency calibration spectrum.
Fig. 3. Ra228 efficiency calibration spectrum.
Fig. 4. Determination of peak area.
Table 2. Determination of detection efficiency using standard radium calibrated sources.
Table 3. Analyzed results of shale produced field samples.
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