1) One kg of fresh and dry thorium nitrate, Th(NO3)4, is produced from a natural occurring thorium containing ore.
2) One gram of natural uranium is purified to contain no other elements than uranium at the time t equals 0.
3) A given amount of alum shale contains 10 gram naturally occurring uranium.
4) Some radionuclei have a major application in medicine. For practical reasons it is advantageous if these can be produced with the help of an isotope generator.
5) A daughter nuclide is eluted from a 100 MBq 44Ti source in a column.
6) Minerals containing thorium emits strong gamma radiation, without any of the involved thorium isotopes emitting gamma.
7) 100 grams of fresh metallic thorium is prepared from naturally occurring thorium containing minerals.
8) A source of 10 000 Bq from the very long lived 194Hg is used to produce 194Au. Assume 100% efficiency in the production process.
9) The radionuclide 211At is planned to be used for medical purposes. It has a branching of 58% EC and 42% α.