Table 1 Isotopic composition of the enriched target material and the level of chemical impurities.

From: Excitation functions of 72Ge(p,xn)72,71As reactions from threshold up to 45 MeV for production of the non-standard positron emitter 72As

Isotope

Isotopic composition [%]

Chemical impurity

Level [ppm]

Ge-70

0.49

Co

 < 0.001

Ge-72

96.42

Cd

 < 0.003

Ge-73

2.94

Fe

0.015

Ge-74

0.145

Mn

 < 0.003

Ge-76

0.005

Cr

 < 0.003

  

Al

0.01

  

Cu

 < 0.003

  

Zn

 < 0.003

  

Ca

 < 0.01

  

Si

0.01

  

Mg

 < 0.003

  

Mo

 < 0.001

  

Ni

 < 0.005