Metals are known for incandescence. However, for the first time
metals have shown UV dominant optical spectrum at room temperature
when present as radioisotopes or X-ray fluorescent (XRF) sources.
Radioisotope 57Co has shown UV dominant optical spectrum at room
temperature.
http://www.geocities.com/raomap/discovery3.html
Despite the fact metals are opaque to light at room temperature UV dominant optical spectrum was detected because excited atoms in radioisotopes and XRF sources act as 'Atomic state of matter' independent of temperature.
http://www.geocities.com/raomap/discovery5.html
Prof.M.A.Padmanabha rao
raomap@yahoo.com