Accession Number : AD0000981


Title :   THE QUENCHING ACTION OF PLUTONIUM AND IRON ON THE FLUORESCENCE OF URANIUM IN SODIUM FLUORIDE PHOSPHORS


Corporate Author : ATOMIC ENERGY RESEARCH ESTABLISHMENT HARWELL (UNITED KINGDOM)


Personal Author(s) : WALTON, G N ; HUTTON, G ; DALZIEL, J A


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/000981.pdf


Report Date : 30 Jul 1952


Pagination or Media Count : 44


Abstract : The effect of Pu and Fe on the fluorescence of U in NaF melts illuminated by UV was measured over a range of concentrations. The transmission of NaF to UV light at different lambda's shows that NaF alone and in combination with Fe has no absorption bands. NaF containing U displays a wide absorption band in the UV. Evidence is presented that Fe has a strong quenching action but does not quench by light absorption. Additional results show that the spectrum of the enhanced fluorescence of U does not change in the presence of small amounts of Fe. The conclusion was that the initially excited states of U, and not the metastable fluorescent state, are subject to quenching by Fe. The experimental quenching curves were interpreted on the basis on energy transfer and light absorption. The distance of energy transfer was calculated to be of the order of 100 A. The alteration of fluorescence with concentration can be explained by assuming that Fe and Pu quench some excitations, but not others, by radiationless energy transfer. U causes self-quenching initially by light absorption and at higher concentrations by energy transfer.


Descriptors :   *FLUORESCENCE , LIGHT , MELTS , ENERGY TRANSFER , QUENCHING , UNITED KINGDOM , ABSORPTION , ABSORPTION SPECTRA , RANGE(DISTANCE) , BAND SPECTRA , METASTABLE STATE , RADIATION , BROADBAND


Subject Categories : Optics


Distribution Statement : APPROVED FOR PUBLIC RELEASE