Determination of elemental abundances from X-ray spectra in the multitemperature approach
Development of elemental analysis by muonic X-ray ... · Development of elemental analysis by...
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Development of elemental analysisby muonic X-ray measurement in J-PARC
K. Ninomiya1, T. Nagatomo2, K. M. Kubo2, P. Strasser3, N. Kawamura3, K. Shimomura3, Y. Miyake3, T. Saito4 and W. Higemoto11 Japan Atomic Energy Agency2 International Christian University3 High Energy Accelerator Research Organization4 National Museum of Japan History
MUSE Elemental Analysis Group
It is expected that muon irradiation and muonic X-ray detection can be applied to non-destructive elemental analysis [1]. In this study, to develop the elemental analysis by muonic X-ray measurement and to investigate the molecular effects on the muonic atom formation, we constructed a new X-ray measuring system in J-PARC.We performed muon irradiation for Tenpo-koban (provided from National Museum of Japan History) for test experiment of elemental analysis. Some muonic lines originated from muon transition in muonic silver and gold were identified, and we determined the component of Tenpo-koban (Au:51%) by muonic X-ray intensities.
Abstract
Introduction
Experimental conditionJ-PARC, MUSE, port-D2sample: tenpo-koban (old Japanese coin)muon momentum: 40MeV/ca number of incident muon:
~10 muons/pulseirradiation time: ~ 4 h
Muonic atom is atom like system that contains negatively charged muon instead of an electron. The energies of muonic X-rays are very large (keV-MeV) because of the large mass of muon (207 times larger than that of an electron). Such high energy X-rays can pass long range without photo absorption, so muonic X-ray detection is expected as a new elemental analysis method for bulk sample without destruction. Figure: Formation and muon cascading process of muonic atom
electronmuon
nucleus
muonic X rayelectronic X ray
muon capture
muon cascade
Introduction
Experimental
Results Discussion
Figure: Experimental setup of this study
Tenpo-koban
From muonic X-ray spectra, Tenpo-koban is Ag-Au alloy
Atomic muon capture ratio for Ag-Au alloy: A(Au/Ag)
Results Discussion
References
Muonic X-ray emission provability per muon
Following information is required for quantitative elemental analysis
Calculated from cascade code[2]
The Z-low (A(Z1/Z2)=Z1/Z2 [3]) is not suitable for most of alloys.Following empirical equation well reproduce the atomic capture ratio for Nb-Ta alloy [4], so we use this equation.A(Z1/Z2)=0.66x(Z1/Z2)[5], for Ag-Au alloy A(Au/Ag)=1.11
Contents of tenpo-kobanOur result is well reproduced the result for general tenpo-koban (Au: 57%) and for the same tenpo-koban from prompt gamma-ray analysis by neutron irradiation on J-PARC NOBORU (Au:54%)[6].
Figure: Muonic X-ray spectrum from germanium detector-2
Table: Muonic X-ray peak analysis for germanium detector-1 and 2
germanium detector-1
germanium detector-2
Au: 51±8 %
[1] H. Daniel, Nucl. Instr. Meth. B3 65(1984)[2] V. R. Akylas and P. Vogel, Comput. Phys. Comm., 15, 291 (1978)[3] E. Fermi and E. Teller, Phys. Rev., 72, 399(1947)[4] H. Daniel et. al., Phys. Rev. A, 59, 3343(1999)[5] V. G. Zinov et. al., Sov. J. Nucl. Phys., 2, 613 (1966) [6] H. Matsue et. al., the 53rd Symposium on Radiochemistry, 3A01
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Front side Back side (HV-side)
DetectorDetector holder
Connector(25 pin)
Connector(25 pin)
PCB
Detector(Pixel structure)
See questions (part 1) !
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Detector unit:
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γγγγ
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γγγγ
Detector is irradiated from the front side (structured contact).
Detector is irradiated from the back side (not structured contact) through the cold plate.
Cryostat cap
Version 1 with closed cryostat cap:
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