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FIGURE 1. Set of lead-lined plastic sleeves (CalicheckDose Calibrator Linearity Test Kit; Fluke Biomedical) for evaluation of dose-calibrator linearity by shield method. Set is supplied with 0.64-cm-thick lead base, color-coded unlined sleeve (to provide activity measurement equivalent to 0 time point measurement of decay method), and 6 color-coded lead-lined sleeves providing attenuation factors nominally equivalent to decay over 6, 12, 20, 30, 40, and 50 h, respectively, for 99mTc.
