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Fig. 1a. Weight vs time (black dots) for simple exponential decay plus a constant background. Red dots are calculated from Eq. (2) for Solver best-fit values ofW₁₀ = 4.825, ₁ = 0.006422, and W_1BG = 1.467. First citation in article

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Fig. 1b. The same data and fit, but with the background term subtracted for both, shown on a log-linear scale. First citation in article

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Fig. 2. Weight vs time (black dots) for the secular equilibrium buildup analogue of a relatively short-lived daughter. Red dots are calculated from Eq. (5) for Solver best-fit values of W_2f = 1.274, ₂ = 0.01513, and W_2BG = 0.2091. First citation in article

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Fig. 3. Apparatus for the decay chain experiment consisted of three plastic bottles, each suspended from its own force probe. Coauthors (L to R) Joseph Johnson and Stephen Fairman. First citation in article

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Fig. 4. Weight vs time (black dots) for the three-member series decay chain. Red dots are calculated from Eqs. (2), (8), and (7) for member #1, #2, and #3, respectively, using Solver best-fit values of W₁₀ = 6.212, ₁ = 0.007285, W_1BG = 2.000, ₂ = 0.01348, W_2BG = 1.966, and W_3BG = 2.786. First citation in article