So far radioisotopes are known for ionizing radiation emissions such as alpha, beta, gamma, and characteristic X-rays. The question is whether gamma, beta, and characteristic X-ray emissions in radioisotopes cause nonionizing radiation, light ?
If these particle interact with the electronic shells they can excite these electrons to higher states. The deexitation can cause light, UV, characteristic X-rays and of course Auger electrons, which produce low energy photons by stripping a lot of electrons away. The extent of this emittence depends on the atomic structure, the element and the binding energies of the hit electrons.
The recent publication in 2010 reported experimental discovery of UV dominant optical emission from radioisotopes (radiochemicals such as 137-Cs, and metal sources like 57-Co). Beta, gamma, and Characteristic X-ray emissions first cause Bharat Radiation (predicted), which in turn causes UV dominant optical emission by valence excitation from within the same excited atoms of radioisotopes by a previously unknown atomic phenomenon, now known as Padmanabha Rao effect.
In 2013, discovery of Bharat Radiation in 12.87 to 31 nm in solar spectrum was reported.
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
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