scholarly journals Quantitative Evaluation of Radiation Damage to Polyethylene Terephthalate by Soft X-rays and High-energy Electrons

2009 ◽  
Vol 113 (7) ◽  
pp. 1869-1876 ◽  
Author(s):  
Jian Wang ◽  
Gianluigi A. Botton ◽  
Marcia M. West ◽  
Adam P. Hitchcock
Keyword(s):  
Radiation Damage ◽  
Polyethylene Terephthalate ◽  
Quantitative Evaluation ◽  
High Energy ◽  
X Rays ◽  
High Energy Electrons

Radiation damage induced by channeling of high energy electrons

1972 ◽  
Vol 11 (2) ◽  
pp. K103-K104 ◽  
Author(s):  
F. Fujimoto ◽  
H. Fujita
Keyword(s):  
Radiation Damage ◽  
High Energy ◽  
High Energy Electrons

Thermoluminescence of irradiated ammonium perchlorate crystals

1976 ◽  
Vol 54 (7) ◽  
pp. 766-770 ◽  
Author(s):  
S. Radhakrishna ◽  
M. Riggin ◽  
P. W. Whippey ◽  
P. W. M. Jacobs
Keyword(s):  
Absorption Spectrum ◽  
Single Crystals ◽  
Heating Rate ◽  
Ammonium Perchlorate ◽  
Uv Light ◽  
High Energy ◽  
X Rays ◽  
Spectroscopic Evidence ◽  
Additional Peak ◽  
High Energy Electrons

The thermoluminescence of single crystals of ammonium perchlorate irradiated with X rays, uv light, or high energy electrons has been measured between 80 and 420 K. With a heating rate of 5 K/min. prominent peaks occur at 95, 113, 134, 246, and 320 K; an additional peak is found at 347 K after longer irradiation times. The absorption spectrum of uv-irradiated ammonium perchlorate has also been measured and shows bands at 300, 360, and 610 nm. A comparison of these data with chemical and spectroscopic evidence obtained by other workers has permitted the probable identification of ClO3−, ClO−, ClO2, and F centres as radiation products. Three thermoluminescent peaks remain unassigned.

scholarly journals Low-dose X-ray structure analysis of cytochrome c oxidase utilizing high-energy X-rays

2019 ◽  
Vol 26 (4) ◽  
pp. 912-921 ◽  
Author(s):  
Go Ueno ◽  
Atsuhiro Shimada ◽  
Eiki Yamashita ◽  
Kazuya Hasegawa ◽  
Takashi Kumasaka ◽  
...  
Keyword(s):  
Radiation Damage ◽  
Low Dose ◽  
High Energy ◽  
Array Detector ◽  
X Rays ◽  
Data Set ◽  
X Ray ◽  
Ligand Structure ◽  
Biology I ◽  
On Line

To investigate the effect of high-energy X-rays on site-specific radiation-damage, low-dose diffraction data were collected from radiation-sensitive crystals of the metal enzyme cytochrome c oxidase. Data were collected at the Structural Biology I beamline (BL41XU) at SPring-8, using 30 keV X-rays and a highly sensitive pixel array detector equipped with a cadmium telluride sensor. The experimental setup of continuous sample translation using multiple crystals allowed the average diffraction weighted dose per data set to be reduced to 58 kGy, and the resulting data revealed a ligand structure featuring an identical bond length to that in the damage-free structure determined using an X-ray free-electron laser. However, precise analysis of the residual density around the ligand structure refined with the synchrotron data showed the possibility of a small level of specific damage, which might have resulted from the accumulated dose of 58 kGy per data set. Further investigation of the photon-energy dependence of specific damage, as assessed by variations in UV-vis absorption spectra, was conducted using an on-line spectrometer at various energies ranging from 10 to 30 keV. No evidence was found for specific radiation damage being energy dependent.

scholarly journals RADIATION DAMAGE IN TUNGSTEN TARGET OF THE “KIPT NEUTRON SOURCE”

2021 ◽  
pp. 17-21
Author(s):  
V.V. Gann ◽  
A.V. Gann ◽  
B.V. Borts ◽  
I.M. Karnaukhov ◽  
P.I. Gladkikh ◽  
...  
Keyword(s):  
Mathematical Modeling ◽  
Elastic Scattering ◽  
Radiation Damage ◽  
Neutron Source ◽  
Particle Transport ◽  
High Energy ◽  
Electromagnetic Shower ◽  
Tungsten Target ◽  
High Energy Electrons

In this work, mathematical modeling of a complex of processes occurring in a tungsten target under irradiation with high-energy electrons with an energy of 100 MeV: an electromagnetic shower, the production of photo-neutrons, and particle transport along the target, damage from neutrons of the subcritical assembly. It was found that the greatest contribution to the rate of damage formation in a tungsten target give the elastic scattering of high-energy electrons on nuclei.

scholarly journals Creation of High-Energy Electron Tails by the Lower-Hybrid Waves and its Relevance to Type II and III Bursts

1985 ◽  
Vol 107 ◽  
pp. 505-508
Author(s):  
Motohiko Tanaka ◽  
K. Papadopoulos
Keyword(s):  
High Energy ◽  
Lower Hybrid ◽  
X Rays ◽  
Type Ii ◽  
High Energy Electron ◽  
Acceleration Mechanism ◽  
High Energy Electrons ◽  
Wave Emission ◽  
Hybrid Waves ◽  
Lower Hybrid Waves

It is commonly anticipated that high-energy electrons play an important role for the wave emission in flare bursts. For instance, electrons with >100 KeV are considered to create microwave emissions through gyro-synchrotron process and hard x-rays may be due to bremstrahlung with >25 KeV electrons. However, electron acceleration mechanism itself is still in speculations.

On Lensless Imaging of Organics with Neutrons, X-Rays, Helium Atoms and Low Energy Electrons: Damage and Iterative Phase Retrieval

2001 ◽  
Vol 7 (S2) ◽  
pp. 268-269
Author(s):  
J.C.H. Spence ◽  
U. Weierstall ◽  
J. Fries
Keyword(s):  
Phase Retrieval ◽  
Iterative Algorithms ◽  
High Energy ◽  
Low Energy ◽  
X Rays ◽  
Noise Sources ◽  
Helium Atoms ◽  
High Energy Electrons ◽  
Elastic Event ◽  
Low Energy Electrons

Recent experiments with X-rays and high energy electrons have shown that image recovery from diffracted intensities is possible for non-periodic objects using iterative algorithms. Application of these methods to biological molecules raises the crucial problem of radiation damage, which may be quantified by Q = ΔE σi/σe, the amount of energy deposited by inelastic events per elastic event. Neutrons, helium atoms and low energy electrons below most ionization thresholds produce the smallest values of Q (see for TMV imaged at 60 eV). For neutrons (λ = 10-2Å, and deuterated, 15N-abelled molecules) Q is ∼3000 times smaller (∼50 times for λ = 1.8Å) than for electrons (80- 500keV) and about 4x 106 times smaller than for soft X-rays (1.5Å). Since σe for neutrons is about 105 times smaller than for electrons (and about 10 times smaller than for soft X-rays), a 105 times higher neutron dose is required to obtain the same S/N in a phase contrast image compared with electrons, if other noise sources are absent.

Energy spectra of high energy electrons and hard X-rays as observed onboard the space probe Venera 11 during the solar flare event of April 13 1979

1981 ◽  
Vol 1 (3) ◽  
pp. 73-76 ◽  
Author(s):  
E.I. Daibog ◽  
E.A. Devicheva ◽  
S.V. Golenetskii ◽  
Yu.A. Guryan ◽  
V.G. Kurt ◽  
...  
Keyword(s):  
Solar Flare ◽  
High Energy ◽  
Energy Spectra ◽  
X Rays ◽  
Space Probe ◽  
Flare Event ◽  
High Energy Electrons
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