Table 2. Results of the chemical investigations of the starting materials performed by ICP-OES and µ-XRF in p.p.m. by weight.

The results of the latter technique are shown in parentheses. Some of the ICP-OES values are below the limit of quantification (LOQ).

Sample	Al	Ca	Ti	V	Cr	Mn	Fe	Zn
Arc-fusion grown material for initial feeds and seeds	81 ± 0.8	(313 ± 66)	< 4.8 (14 ± 3)	36 ± 0.43 (25 ± 1)	28 ± 0.67 (72 ± 18)	13 ± 0.16 (4 ± 2)	76 ± 0.88 (72 ± 2)	< 4.2 (0–15)
MgO ceramic target sample as delivered (manufactured by Kojundo, theoretical purity given by the manufacturer: 99.995%)	< 10.8	(29 ± 1)	< 4.8	< 9.3	< 12.3	8 ± 0.07	8 ± 0.35	11 ± 0.1
5N (99.999%) MgO powder as delivered by Roth (Rotimetic)	< 3.1–16	< 0.07–0.8	< 0.8	< 2	< 1	< 0.3	< 1.9	< 0.8