Low-level X-ray exposures on rat skin

1994 ◽  
Vol 46 (3) ◽  
pp. 203-210 ◽  
Author(s):  
Jyotirmoy Chatterjee ◽  
Kuntala De ◽  
S. K. Basu ◽  
A. K. Das
Keyword(s):  
Rat Skin ◽  
X Ray ◽  
Low Level

scholarly journals UV and X-ray observations of the neutron star LMXB EXO 0748–676 in its quiescent state

2020 ◽  
Vol 501 (1) ◽  
pp. 1453-1462
Author(s):  
A S Parikh ◽  
N Degenaar ◽  
J V Hernández Santisteban ◽  
R Wijnands ◽  
I Psaradaki ◽  
...  
Keyword(s):  
Neutron Star ◽  
Thermal Emission ◽  
Hubble Space Telescope ◽  
Dense Matter ◽  
Continuum Emission ◽  
Quiescent State ◽  
X Ray ◽  
Low Level ◽  
Low Mass ◽  
Different Origins

ABSTRACT The accretion behaviour in low-mass X-ray binaries (LMXBs) at low luminosities, especially at <1034 erg s−1, is not well known. This is an important regime to study to obtain a complete understanding of the accretion process in LMXBs, and to determine if systems that host neutron stars with accretion-heated crusts can be used probe the physics of dense matter (which requires their quiescent thermal emission to be uncontaminated by residual accretion). Here, we examine ultraviolet (UV) and X-ray data obtained when EXO 0748–676, a crust-cooling source, was in quiescence. Our Hubble Space Telescope spectroscopy observations do not detect the far-UV continuum emission, but do reveal one strong emission line, C iv. The line is relatively broad (≳3500 km s−1), which could indicate that it results from an outflow such as a pulsar wind. By studying several epochs of X-ray and near-UV data obtained with XMM–Newton, we find no clear indication that the emission in the two wavebands is connected. Moreover, the luminosity ratio of LX/LUV ≳ 100 is much higher than that observed from neutron star LMXBs that exhibit low-level accretion in quiescence. Taken together, this suggests that the UV and X-ray emission of EXO 0748–676 may have different origins, and that thermal emission from crust-cooling of the neutron star, rather than ongoing low-level accretion, may be dominating the observed quiescent X-ray flux evolution of this LMXB.

Low Level Iodine Detection by TXRF Spectrometry

1988 ◽  
Vol 32 ◽  
pp. 251-253 ◽  
Author(s):  
F. Hegedüs ◽  
P. Winkler
Keyword(s):  
Measurement Technique ◽  
Water Samples ◽  
Light Water Reactor ◽  
Reactor Safety ◽  
Total Reflectance ◽  
Light Water ◽  
Water Reactor ◽  
X Ray ◽  
Low Level ◽  
Special Measurement

A special measurement technique has been developed to measure very low level iodine concentrations. The gas and water samples to be analysed are taken from the POSEIDON facility at PSI where retention of iodine in water pools in conjunction with light water reactor safety analysis is under investigation. The amount of iodine was measured by means of a Total Reflectance X-Ray Spectrometer (TXRF).

Rapid, low-level X-ray variability in active late-type dwarfs

1987 ◽  
Vol 65 ◽  
pp. 273 ◽  
Author(s):  
Carol W. Ambruster ◽  
Salvatore Sciortino ◽  
L. Golub
Keyword(s):  
Late Type ◽  
X Ray ◽  
Low Level

Uranium Concentration Measurement in Water Samples with TXRF

1991 ◽  
Vol 35 (B) ◽  
pp. 965-967
Author(s):  
F. Hegedus ◽  
P. Winkler
Keyword(s):  
Water Samples ◽  
Uranium Concentration ◽  
Total Reflection ◽  
Fluorescence Method ◽  
Concentration Measurement ◽  
X Ray ◽  
Low Level

AbstractThe Total Reflection X-Ray Fluorescence method was used to detect low level (ppb) uranium concentration in water.

Space-resolved keV spectroscopy study of neonlike x-ray laser plasmas created with low-level prepulse irradiation

1995 ◽  
Author(s):  
Marc Nantel ◽  
Annie Klisnick ◽  
Gerard Jamelot ◽  
P. B. Holden ◽  
Pierre Jaegle ◽  
...  
Keyword(s):  
Spectroscopy Study ◽  
X Ray ◽  
Low Level ◽  
Laser Plasmas
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