So far, X-ray source such as XRF source or X-ray tube used in hospital is known for X-ray emission alone. The question is whether X-rays are followed by UV from within the same excited atoms of X-ray source?
Here is an URL where you can find all the informations you need.
X-Ray Data Booklet, 2001, Lawrence Berkeley National Laboratory,
LBNL/Pub-490 Rev.2, http://xdb.lbl.gov/, updated Oct.
2009, s. http://cxro.lbl.gov/PDF/X-Ray-Data-Booklet.pdf
A simplified answer is ”Yes, it can.”
If we consider simple X-Ray tube where X-Ray emission is created due to electron impact, due to the presence of continuous radiation (bremsstrahlung) the UV radiation could be expected. As well, due to complex character of de-excitation processes (and due to polychromatic X-Ray sources in standard XRF spectrometers), UV radiation could be also expected within XRF. In some cases even visible light is created (cathodoluminiscence). Also heating of the material means emission in IR region.
However absorption coefficients of most of the materials (including air) are high for soft X-Ray and hard UV radiation, thus the emission to ambient will be practically very limited. E.g. for classical X-Ray tube the emission at given wavelengths will be very limited at least due to presence of exit window of X-Ray tube.
Dear Mr. Jan Gutwirth,•
Bremsstrahlung spectrum falls with energy. However the end of the graph does not extend up to UV. Literature does not have any experimental evidence on UV, visible light and near infrared light following bremsstrahlung or theoretical prediction on it.
UV radiation cannot be expected from within a XRF source, since X-rays being ionizing radiation cannot excite valence electron to optical levels and cause UV.
Cathodoluminiscence do not include UV.
The recent publication reports XRF (X-ray fluorescent) source emits UV. X-ray first cause Bharat Radiation (predicted) with energy at eV level, and Bharat Radiation in turn causes UV dominant optical emission from within the same excited atom by a previously unknown atomic phenomenon, now known as Padmanabha Rao effect. In 2013, Bharat Radiation in the range 12.87 to 31 nm was found in solar spectrum
Reference:
M.A.Padmanabha Rao ,
UV dominant optical emission newly detected from radioisotopes and XRF sources,
Braz. J. Phy., 40, no 1, 38-46,2010.
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-97332010000100007
Dear Hanno Krieger, Justus-Liebig-Universität Gießen
I have glanced at the following sites suggested by you. They provide dedicated data on X-rays:
X-Ray Data Booklet, 2001, Lawrence Berkeley National Laboratory,
LBNL/Pub-490 Rev.2, http://xdb.lbl.gov/, updated Oct.
2009, s. http://cxro.lbl.gov/PDF/X-Ray-Data-Booklet.pdf"
Recent findings on UV emission from XRF source can be viewed from Braz. J. Phy., 40, no 1, 38-46,2010 mentioned above.
Dear Scott Williams, Your view “UV radiation is still part of bremsstrahlung spectra” is untrue. There was no literature on experimental finding or theoretical prediction on UV emission from X-ray tube or XRF source, prior to my research work with XRF sources published from 1997 onwards. High energetic electron is needed for generating bremsstrahlung. As charge around proton is also very high, electron loses energy in keV while passing through Coulomb space resulting into bremsstrahlung with energy in keV. Significant charge around proton in Coulomb space does not allow electron to lose energy just at eV level and generate UV. Therefore, it is not a matter of UV absorption in target material.
By virtue of fine X-ray energy, XRF sources emit UV dominant atomic spectra that I have verified with narrow and optical filters. Though the previously unknown phenomenon of X-rays causing UV (Fig.6 of Braz.Jour.Phy, March 2010) is the same even with X-ray tube, I could not extend my study further to record UV spectrum from X-ray tube before my retirement in 1997. I hope our discussion will arouse interest in readers to study the exact nature of spectrum.
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