Preliminary Status Report of Neutron Radiation Effects and Damage to Neutron Imaging System Equipment at Lawrence Livermore National Laboratory

2017 ◽  
Author(s):  
D. L. Bleuel ◽  
S. Anderson ◽  
L. A. Bernstein ◽  
C. A. Brand ◽  
J. A. Brown ◽  
...  
Keyword(s):  
Radiation Effects ◽  
Imaging System ◽  
Lawrence Livermore National Laboratory ◽  
National Laboratory ◽  
Neutron Radiation ◽  
Neutron Imaging ◽  
Status Report ◽  
Neutron Radiation Effects

Neutron Radiation Effects on Lubricants and O-Rings for Target and Accelerator Applications

2021 ◽  
Vol 1024 ◽  
pp. 127-133
Author(s):  
Matteo Ferrari ◽  
Aldo Zenoni ◽  
Yong Joong Lee ◽  
Alberto Andrighetto
Keyword(s):  
Gamma Radiation ◽  
Radiation Damage ◽  
Radiation Effects ◽  
Nuclear Reactor ◽  
Neutron Radiation ◽  
Radioactive Isotopes ◽  
Structural Level ◽  
Radiation Resistant ◽  
Under Construction ◽  
Neutron Radiation Effects

Lubricants and O-rings are necessarily used for the construction of many accelerator-driven facilities as spallation sources or facilities for the production of radioactive isotopes. During operation, such component will absorb high doses of mixed neutron and gamma radiation, that can degrade their mechanical and structural properties. Experimental radiation damage tests of these components are mandatory for the construction of the facility. Methodologies for irradiation in nuclear reactor mixed fields and post-irradiation examination of lubricating oils, greases and O-rings were developed and are here presented. Samples were characterized with standard mechanical and physical-chemical tests. Parametric studies on the dose rate effects have been performed on O-rings. A case studies for a specific O-ring application in a gate valve has been developed. Some of the tested samples showed a dramatic change of their properties with dose, while others remain stable. Results were collected on nine commercial greases, on one oil and on four commercial elastomeric O-rings. The most radiation resistant among the selected products are now considered for application in facilities under construction. The main mechanisms of neutron and gamma radiation damage on these polymers were investigated at the mechanical and structural level.

scholarly journals Fast-neutron radiation effects in a silica-core optical fiber studied by a CCD-camera spectrometer

1994 ◽  
Vol 33 (6) ◽  
pp. 1022 ◽  
Author(s):  
D. L. Griscom ◽  
M. E. Gingerich ◽  
E. J. Friebele ◽  
M. Putnam ◽  
W. Unruh
Keyword(s):  
Optical Fiber ◽  
Fast Neutron ◽  
Radiation Effects ◽  
Ccd Camera ◽  
Neutron Radiation ◽  
Silica Core ◽  
Neutron Radiation Effects

scholarly journals Neutron radiation effects on linear CCDs at different clock pulse frequency

AIP Advances ◽  
2015 ◽  
Vol 5 (6) ◽  
pp. 067131
Author(s):  
Zujun Wang ◽  
Wei Chen ◽  
Benqi Tang ◽  
Zhigang Xiao ◽  
Zhibin Yao ◽  
...  
Keyword(s):  
Radiation Effects ◽  
Neutron Radiation ◽  
Pulse Frequency ◽  
Clock Pulse ◽  
Neutron Radiation Effects

Neutron radiation effects in GaAs planar doped barrier diodes

1993 ◽  
Vol 40 (2) ◽  
pp. 102-104
Author(s):  
M.J. Kearney ◽  
N.R. Couch ◽  
M. Edwards ◽  
I. Dale
Keyword(s):  
Radiation Effects ◽  
Neutron Radiation ◽  
Neutron Radiation Effects

scholarly journals The Application of Thick Hydrogenated Amorphous Silicon Layers to Charged Particle and X-Ray Detection

1989 ◽  
Vol 149 ◽  
Author(s):  
V. Perez-Mendez ◽  
G. Cho ◽  
I. Fujieda ◽  
S. N. Kaplan ◽  
S. Qureshi ◽  
...  
Keyword(s):  
Amorphous Silicon ◽  
Radiation Effects ◽  
Neutron Radiation ◽  
Signal Amplitude ◽  
X Rays ◽  
Noise Sources ◽  
Leakage Currents ◽  
Γ Rays ◽  
Neutron Radiation Effects ◽  
Position Sensitive Detectors

ABSTRACTWe outline the characteristics of thick hydrogdenated amorphous silicon layers which are optimized for the detection of charged particles, x-rays and γ-rays. Signal amplitude as a function of the linear energy transfer of various particles are given. Noise sources generated by the detector material and by the thin film electronics - a-Si:H or polysilicon proposed for pixel position sensitive detectors readout are described, and their relative amplitudes are calculated. Temperature and neutron radiation effects on leakage currents and the corresponding noise changes are presented.

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