scholarly journals Research on laser-removal of a deuterium deposit from a graphite sample

2014 ◽  
Vol 508 ◽  
pp. 012015
Author(s):  
M Kubkowska ◽  
E Skladnik-Sadowska ◽  
K Malinowski ◽  
M J Sadowski ◽  
M Rosinski ◽  
...  
Keyword(s):  
Radiocarbon ◽  
1995 ◽  
Vol 37 (2) ◽  
pp. 705-710 ◽  
Author(s):  
Zhiyu Guo ◽  
Kexin Liu ◽  
Kun Li ◽  
Jianjun Wang ◽  
Bin Li ◽  
...  

AMS radiocarbon measurements were started at Peking University in 1992 with a modified HICONEX 834 ion source. Some archaeological samples were measured at a sensitivity of 10−14 with ca. 1.7% precision for modern samples. We have made many improvements in our first two years of operation: a high-intensity Cs sputtering ion source was installed; the graphite sample preparation technique was investigated; and the system stability has been improved. The blank sample background is currently ca. 0.006 MC and a precision within 1% can be reached for modern samples. Geological, archaeological, environmental and biomedical samples can be measured routinely. We present some typical applications.


Author(s):  
V. A. Gulevsky ◽  
N. Yu. Miroshkin ◽  
S. N. Tsurikhin ◽  
N. A. Kidalov

An increase in the efficiency of gas-free impregnation of a porous carbon-graphite frame to aluminum alloys by applying thin electroplated metal alloying coatings to the surface of the pores of a carbon-graphite sample by electrochemical method is investigated. It is shown that the preliminary deposition of such coatings makes it possible to obtain alloying with highly pure elements, increasing the filling of pores with matrix melt at impregnation temperature (800 ° C).


Shinku ◽  
1989 ◽  
Vol 32 (3) ◽  
pp. 244-247
Author(s):  
Susumu AMEMIYA ◽  
Katsuhiko YAMAZAKI ◽  
Takashi MATSUMURA ◽  
Daizo AMANO ◽  
Yasunari ONODA

Author(s):  
Se-Hwan Chi ◽  
Cristian I. Contescu ◽  
Timothy D. Burchell

The strong correlation between the density and the physical and, mechanical properties of graphite suggests that the method of nondestructive density evaluation could be developed into a characterization technique of great value for the overall improvement of safety of graphite moderator reactors. In this study, the oxidation-induced density changes in nuclear graphite for VHTR were determined by a conventional destructive bulk density measurement method (BM), and by a new non-destructive method based on acoustic microscopy and image processing (AM). The results were compared in order to validate the applicability of the latter method. For a direct comparison of the results from both measurements, two specimens were prepared from a cylindrical graphite sample (1 inch diameter and 1 inch height, oxidized to 10% weight loss at 973 K in air for 5 hours). The specimens were used for characterization by BM and AM methods, respectively. The results show that, even with a large standard deviation of the AM, the density changing trend from both methods appeared the same. This observation may be attributed to the fact that AM images reflect characteristic density changes of the graphite sample through the acoustic impedance changes. This study demonstrates the possibility of using AM as a nondestructive technique for the evaluation of density changes in graphite when a database is prepared through a systematic series of experiments.


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