. 2023 Jan;64(1):173–176. doi: 10.2967/jnumed.122.264009

TABLE 1.

Data on Performance of Generators Based on ²²⁰Rn Emanation from Source of ²²⁴Ra or ²²⁸Th in Equilibrium with Its Daughters

Type of generator	Yield	Available ²¹²Pb in washout	Radioactivity breakthrough of parent source nuclide
²²⁴Ra source	62% (56%^*)	91%	0.02%^† (0.0004%–0.14%)
²²⁸Th source	68%^‡	87%	0.0001%–0.005%^¶

Second-time use of generator (n = 3).

^{^†}

Average of 9.

^{^‡}

Average of multiple uses of single generator (n = 8).

^{^¶}

In 6/8 samples, measured radioactivity was below quantification limit after >2 mo (<0.0015% breakthrough; Supplemental Section 1).