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M. Young and A. E. Costley, Members of the ITER-JCT, ITER Home Teams and the ITER Diagnostics Expert Group, An overview of ITER diagnostics, Rev. Sci. , 68: 862–867, 1997. 30. K. F. , A low noise highly integrated bolometer array for absolute measurement of VUV and soft X-radiation, Rev. Sci. , 62: 744–750, 1991. 10. J. , 32: 495–524, 1997. 31. L. C. , and the ITER Joint Central Teams and Home Teams, Overview of Fusion Product Diagnostics for ITER, in P. E. Stott, G. Gorini and E. ), Diagnostics for Experimental Thermonuclear Fusion Reactors, New York: Plenum Press, 1998, pp.
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For this purpose a gas containing a nucleus with a very large cross section for absorbing thermal neutrons is introduced into the chamber. Boron trifluoride (BF3), which serves both as the chamber gas and as the reaction target, is commonly used for this purpose. The nuclear reaction that takes place is 10B(n, Ͱ)7Li. The alpha particle and 7Li ion produce the ionization in the gas. Boron trifluoride chambers can be used for broad-spectrum neutron dose monitors. In this case, the chamber is surrounded with plastic or another material rich in hydrogen to moderate the neutrons down to thermal energy where the 10 B(n, Ͱ) reaction will take place.
40.Nuclear Science by John G. Webster (Editor)