The Radioactive Decay Pattern of Blue Topaz Treated by Neutron Irradiation
A systematic study of 15 neutron-irradiated blue topaz samples was conducted using high-purity germanium (HPGe) digital gamma-ray spectroscopy.
Reactor-Irradiated Green Topaz
Examination of samples of faceted "Ocean green" topaz reveals that this material has been irradiated in a nuclear reactor.
Thermal Alteration of Inclusions in "Rutilated" Topaz
Faceted colourless topaz containing acicular inclusions has been offered for sale as "rutilated" topaz.
Colouring of Topaz by Coating and Diffusion Processes: An X-Ray Photoemission Study of What Happens Beneath the Surface
Surface-treated topaz has become a viable alternative to topaz coloured by irradiation.
Irradiated Topaz and Radioactivity
Large quantities of colourless topaz are currently being treated by gamma irradiation to turn them blue.
Altering the Colour of Topaz
A review of the various techniques in use today to change colourless topaz to a variety of hues.