scholarly journals A STUDY ON RADIATION DAMAGE MECHANISM IN PbWO4 SCITILLATING CRYSTALS

1999 ◽  
Vol 48 (7) ◽  
pp. 1282
Author(s):  
FENG XI-QI ◽  
HAN BAO-GUO ◽  
HU GUAN-QIN ◽  
ZHANG YAN-XING
Keyword(s):  
Radiation Damage ◽  
Damage Mechanism

Morphological and structural evolution of WS2 nanosheets irradiated with an electron beam

2015 ◽  
Vol 17 (4) ◽  
pp. 2678-2685 ◽  
Author(s):  
Yuqing Wang ◽  
Yi Feng ◽  
Yangming Chen ◽  
Fei Mo ◽  
Gang Qian ◽  
...  
Keyword(s):  
Electron Beam ◽  
Radiation Damage ◽  
Structural Evolution ◽  
Damage Mechanism ◽  
P Movement ◽  
Ws2 Nanosheets

Movement of atoms and the radiation damage mechanism in irradiated WS2 nanosheets.

Synchrotron Radiation Damage Mechanism of X-Ray Mask Membranes Irradiated in Helium Environment

1992 ◽  
Vol 31 (Part 1, No. 12B) ◽  
pp. 4459-4462 ◽  
Author(s):  
Tomiyuki Arakawa ◽  
Hiroshi Okuyama ◽  
Koichi Okada ◽  
Hiroyuki Nagasawa ◽  
Tsutomu Syoki ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Radiation Damage ◽  
Damage Mechanism ◽  
X Ray

Surface-structure dependence of healing radiation-damage mechanism in nanoporous tungsten

2018 ◽  
Vol 498 ◽  
pp. 362-372 ◽  
Author(s):  
Guohua Duan ◽  
Xiangyan Li ◽  
Jingjing Sun ◽  
Congyu Hao ◽  
Yichun Xu ◽  
...  
Keyword(s):  
Surface Structure ◽  
Radiation Damage ◽  
Damage Mechanism ◽  
Structure Dependence

Effects of soft X-ray radiation damage on paraffin-embedded rat tissues supported on ultralene: a chemical perspective

2018 ◽  
Vol 25 (3) ◽  
pp. 848-856 ◽  
Author(s):  
Diana E. Bedolla ◽  
Andrea Mantuano ◽  
Arissa Pickler ◽  
Carla Lemos Mota ◽  
Delson Braz ◽  
...  
Keyword(s):  
Sample Preparation ◽  
Radiation Damage ◽  
Structural Changes ◽  
Damage Mechanism ◽  
Exposure Dose ◽  
Rat Tissues ◽  
Structural Morphology ◽  
X Ray ◽  
Tissue Lipids ◽  
Embedding Medium

Radiation damage is an important aspect to be considered when analysing biological samples with X-ray techniques as it can induce chemical and structural changes in the specimens. This work aims to provide new insights into the soft X-ray induced radiation damage of the complete sample, including not only the biological tissue itself but also the substrate and embedding medium, and the tissue fixation procedure. Sample preparation and handling involves an unavoidable interaction with the sample matrix and could play an important role in the radiation-damage mechanism. To understand the influence of sample preparation and handling on radiation damage, the effects of soft X-ray exposure at different doses on ultralene, paraffin and on paraffin-embedded rat tissues were studied using Fourier-transform infrared (FTIR) microspectroscopy and X-ray microscopy. Tissues were preserved with three different commonly used fixatives: formalin, glutaraldehyde and Karnovsky. FTIR results showed that ultralene and paraffin undergo a dose-dependent degradation of their vibrational profiles, consistent with radiation-induced oxidative damage. In addition, formalin fixative has been shown to improve the preservation of the secondary structure of proteins in tissues compared with both glutaraldehyde and Karnovsky fixation. However, conclusive considerations cannot be drawn on the optimal fixation protocol because of the interference introduced by both substrate and embedding medium in the spectral regions specific to tissue lipids, nucleic acids and carbohydrates. Notably, despite the detected alterations affecting the chemical architecture of the sample as a whole, composed of tissue, substrate and embedding medium, the structural morphology of the tissues at the micrometre scale is essentially preserved even at the highest exposure dose.

The Study of Radiation Damage Mechanism on Ultra-Structures of Leukocytes and Platelets in Rat Cells

2012 ◽  
Vol 45 (1) ◽  
pp. 48-54 ◽  
Author(s):  
Tae-Jeong Ji ◽  
Kyung-Rae Dong ◽  
Woon-Kwan Chung
Keyword(s):  
Radiation Damage ◽  
Damage Mechanism

A Raman Scattering, Ion Channelling and Photoluminescence Study of Argon Ion Radiation Damage in Cu(Ga,In)Se2 - Dose Dependence and Dose Rate Effects

1998 ◽  
Vol 540 ◽  
Author(s):  
G. Lippold ◽  
K. Weinert ◽  
M.V. Yakushev ◽  
R.D. Pilkington ◽  
K. Otte ◽  
...  
Keyword(s):  
Dose Rate ◽  
Radiation Damage ◽  
High Efficiency ◽  
Defect Density ◽  
Lattice Structure ◽  
Dose Range ◽  
Damage Mechanism ◽  
Dose Dependence ◽  
Beam Current Density ◽  
Ion Channeling

AbstractThe ternary chalcopyrite semiconductor CuInSe2 and related ternary compounds are promising materials for the production of high-efficiency thin film solar cells. In this paper we study the dose dependence of ion radiation damage produced by 30 keV and 80 keV Ar ions in single crystals and polycrystalline films of Cu(In,Ga)Se 2 over a wide dose range from 1012 to 1017 cm-2, using Raman spectroscopy and ion channeling measurements. For the first time, we also report on the dose rate dependence with a variation of the beam current density in the range 0.44 to 44 µcm-2. Even for low damage levels no significant dependence of the defect concentration or damage mechanism on the dose rate could be observed. From phonon correlation length considerations we estimate defect densities. They are in agreement with ion channeling data obtained in the 1015 to 1016 dose range, where the breakdown of the lattice structure occurs. In this dose range, the defect density is close to the concentration of implanted atoms. We conclude, that this high impurity concentration is responsible for the amorphization.

scholarly journals A Two-accelerator Facility and Its Use for Radiation Damage Studies in Alkali Halides

1980 ◽  
Vol 33 (3) ◽  
pp. 549
Author(s):  
CS Newton ◽  
HJ Hay
Keyword(s):  
Radiation Damage ◽  
Simultaneous Detection ◽  
Experimental Studies ◽  
Target Material ◽  
Experimental System ◽  
Alkali Halides ◽  
Damage Mechanism ◽  
X Rays ◽  
Accelerator Facility ◽  
Light Ions

An experimental system is described in which heavy ions of energies 50-100 MeV, and light ions of energies 0�5-2 MeV, may be transported alternatively from different accelerators into a common scattering chamber. Details are given of the beam transport and ~ttering chamber, the latter being designed to make in-beam studies of different modes of radiation damage in the target material. An on-line experimental control and data acquisition system with an IBM 1800 computer is used. Experimental studies are described of simultaneous detection of backscattered helium ions, X-rays and optical absorption in single-crystal alkali halide samples, performed during continuous irradiation by a 1 MeV helium beam, as well as of backscattered protons following intermittent irradiation by a 60 MeV oxygen beam. Analysis of the relative damage by these two beams is discussed in relation to a damage mechanism due to Pooley.

Studies of Radiation Damage Mechanism — by Optical Diffraction Analysis and High Resolution Image

1978 ◽  
Vol 36 (3) ◽  
pp. 49-60
Author(s):  
Y. Murata
Keyword(s):  
Electron Diffraction ◽  
Radiation Damage ◽  
Damage Mechanism ◽  
Optical Diffraction ◽  
Structure Damage ◽  
Specimen Area ◽  
Intense Electron Beam ◽  
Quick Estimate ◽  
Molecular Damage ◽  
Intensity Decay

In the study of organic or biological materials by electron microscopy, a structure damage caused by an intense electron beam is a fatal limitation. Several methods have been used to measure a degree of radiation damage ( see reviews: Relmer 1975, Glaeser 1975). Simple one is a measurement of diffraction intensity decay. It obviously gives a quick estimate of crystal destruction. One thing we must first consider is that in the conventional electron diffraction, area-selection is of the order of 1~2 μim in diameter. Thus an information from the intensity decay is of an average nature from the gross irradiated materials (Stenn & Bahr 1970). Furthermore we assume tacitly that the crystal is destroyed homogeneously over the wide specimen area. If the system we are concerning is homogeneous, no problem through the analysis of the electron diffraction arises. But radiation damage does not always occur in this way. There is no way of distinguishing between damaged area and undamaged area by conventional electron diffraction. For better understanding of damage mechanism down to molecular level, it may not be sensitive method. On the other hand, an information of molecular damage is obtained from electron energy-loss measurement (Isaacson, Johnson & Crewe 1973).

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