literature. Table 1 lists the elements, the chemical form of the precipitate, the separation time, and the procedure number given in Part II. Many of the procedures either are for the separation of parent from daughter activities (or vice versa) or are for the separation of a specific element from activities of neighboring elements that could be produced in charged-particle reactions. Technetium was separated from a molybdenum parent by precipitation with tetraphenylarsonium chloride in the presence of tartaric acid. The separation was achieved in 5 to 6 s [Fle56]. Livingood and Seaborg [Liv38] used precipitation of MnO₂ to separate manganese activities from deuteron-irradiated iron and chromium and from ⁴He-bombarded vanadium. None of the procedures, for example, provided the kind of separation needed to isolate a specific element from a complex mixture such as fission products. For example, Lin and Wahl [Lin73] used Sn(II) sulfide precipitation to quickly separate Sn(II) and Sn(IV) formed in fission. Tellurium was later separated from Sn(II) and Sn(IV), purified, and the activity of daughter products measured. Frequently, precipitation is used as the final step to obtain the activities in a convenient form for counting. Nuh and coworkers [Nuh75] volatilized molecular iodine from a fission-product solution and collected it in a bisulfite solution; they precipitated AgI from this solution and used it for counting.

Figure 1. Elements with fast procedures based on precipitation (shown with bold rectangles).