NDLI: Intense photon emission induced by fracture of γ–irradiated Dy-, Tm-, Sm- and Mn-doped $CaSO_{4}$ single crystals

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Intense photon emission induced by fracture of γ–irradiated Dy-, Tm-, Sm- and Mn-doped $CaSO_{4}$ single crystals

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Chandra, B. P. Tiwari, C. S. Sharma, R.
Description	Country affiliation: India Author Affiliation: Chandra BP ( Department of Applied Physics, Ashoka Institute of Technology and Management, G.E. Road, Rajnandgaon, 491441 (C.G.), India. bpchandra4@yahoo.co.in)
Abstract	When an γ-irradiated Dy-, Tm-, Sm- or Mn-doped $CaSO_{4}$ crystal is impulsively deformed, two peaks appear in the ML intensity versus time curve, whereby the first ML peak is found in the deformation region and the second in the post-deformation region of the crystals. In this study, intensities $I_{m1}$ and $I_{m2}$ corresponding to first and second ML peaks, respectively, increased linearly with an impact velocity $v_{0}$ of the piston used to deform the crystals, and times $t_{m1}$ and $t_{m2}$ corresponding to the first and second ML peaks, respectively, decreased with impact velocity. Total ML intensity initially increased with impact velocity and then reached a saturation value for higher values of impact velocity. ML intensity increased with increasing γ-doses and size of crystals. Results showed that the electric field produced as a result of charging of newly-created surfaces caused tunneling of electrons to the valence band of the hole-trapping centres. The free holes generated moved in the valence band and their subsequent recombination with electron trapping centres released energy, thereby resulting in excitation of luminescent centres. Copyright © 2012 John Wiley & Sons, Ltd.
File Format	HTM / HTML
ISSN	15227235
Issue Number	3
Volume Number	28
e-ISSN	15227243
Journal	Luminescence
Language	English
Publisher	Wiley-Blackwell
Publisher Date	2013-05-01
Publisher Place	Great Britain (UK)
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Biophysics Discipline Biochemistry Calcium Sulfate Chemistry Dysprosium Luminescent Agents Manganese Samarium Thulium Gamma Rays Luminescent Measurements Methods Photons Journal Article
Content Type	Text
Resource Type	Article
Subject	Chemistry Biophysics

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