Abstract

Three sets of specimens were prepared in which thorium oxide contained as activators praseodymium, samarium and terbium in concentrations varying by known amounts. The specimens activated by praseodymium varied from 1 atom of praseodymium in 100 molecules of thorium oxide to 1 atom in 100,000 molecules; those activated by samarium from 1 atom in 15.5 molecules to 1 atom in 2000 molecules: those activated by terbium from 1 atom in 10 molecules to 1 atom in 40,000 molecules. The intensity of luminescence of specimens in each set was measured and the concentration of greatest brightness, the optimum concentration, determined for each of the following sources of excitation: cathode rays, ultraviolet light and hydrogen flame. The results show that the optimum concentration is different for each of the sources of excitation used. In all cases the concentration required for the optimum under cathode rays is less than that for the other methods of excitation used.

PDF Article

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription