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Source of luminescence of water lower energy than the Cerenkov-light threshold during irradiation of carbon-ion
- Source :
- Journal of Physics Communications. 2:065010
- Publication Year :
- 2018
- Publisher :
- IOP Publishing, 2018.
-
Abstract
- Although luminescence of water during irradiations of proton and carbon-ion lower energy than the Cerenkov-light threshold were found recently, the sources of the luminescence were not yet obvious. To estimate the sources of the luminescence, we measured the light spectrum of the luminescence of water during carbon-ion irradiations and estimated the sources of the luminescence. Using an ultraviolet (UV) light sensitive charge coupled device (CCD) camera, we measured the luminescence images of water during carbon-ion beam irradiations by changing optical filters, derived the light spectra of the luminescence of water and compared with the calculated results. The intensity of the measured light spectrum of the luminescence of water at the Bragg peak region was decreased as the wavelength of light proportional to ~ λ to the -2.0th power where λ is the wavelength of the light, indicating the source of the luminescence of water can be electromagnetic pulse produced by the dipole displacement inside the water molecules. In the shallow part of the water prior to the Bragg peak, where the Cerenkov-light is included, the spectrum showed steeper curve that is proportional to ~ λ to the -2.6th power, which was similar to the calculated spectrum of Cerenkov-light including the refractive index changes of water with the wavelength of light. From these results, the luminescence of water is thought to be mainly come from electromagnetic pulse produced by the dipole displacement inside the water molecules.
- Subjects :
- Materials science
010308 nuclear & particles physics
Physics::Optics
General Physics and Astronomy
Bragg peak
medicine.disease_cause
01 natural sciences
Spectral line
030218 nuclear medicine & medical imaging
03 medical and health sciences
Wavelength
Dipole
0302 clinical medicine
0103 physical sciences
medicine
Irradiation
Atomic physics
Luminescence
Refractive index
Ultraviolet
Subjects
Details
- ISSN :
- 23996528
- Volume :
- 2
- Database :
- OpenAIRE
- Journal :
- Journal of Physics Communications
- Accession number :
- edsair.doi.dedup.....de1e10447945c8d3a115dec57edfe713