The determination of oxygen in nickel and copper

Nickel and copper were analyzed (221) using a photon beam with a maximum energy of 35 MeV (Im = 75 mA). The samples (diameter 15 mm, thickness 1 mm, weight 1.3 to 1.4 g) were irradiated for 4 minutes each, together 

The etching solutions used before and after irradiation are respectively 

3 volumes nitric, 1 volume sulphuric, 1 volume phosphoric and 5 volumes 

In the case of nickel an iron bath is used (Fe/Ni = 5) for copper 2 g of ordinary copper are added to each sample. The results were (7.5 + 0.3)/ g/g for nickel and (1.06 + 0.08)Mg/g for OFHC copper. 

Neider et al. (262) also used photon activation = 30 MeV) combined 

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