SET 1 - 小型高輝度 X線源とイメージング基盤技術開発

小型加速器による小型高輝度X線源とイメージング基盤技術開発第９回全体打合せ（2014.12.24＠産総研）
サブテーマ名小型高輝度X線発生装置を用いたＸ線位相イメージング法の開発
東北大学　多元物質科学研究所百生　敦 Margie P. Olbinado
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Comparison with the 3-‐gra$ng set used with X-‐LCS experiment The performance of the interferometer (SET 1) is compared with another 3-‐graLng set (SET 2) that was previously used with the LCS X-‐ray Source at a design energy of 25 keV. The parameters are as shown: Gra$ng Parameters SET 1 SET 2 Gra$ng distances at 25 keV SET 1 SET 2 G0 period, d0 (µm) 6.82 22.7 Source-‐ G0 (mm) 706 706 G0 duty cycle 0.26 0.35 G0 – G1, R1 (mm) 245.5 995 G0 height (µm) 70 65 G1 – G2, z (mm) 269.6 237.6 G1 period, d1 (µm) 3.57 4.36 Source – G2, R2 (mm) 1221.1 1938.6 G2 period, d2 (µm) 7.49 5.4 G2 height (µm) 100 70 •  SET 1 •  Smaller G0 duty cycle, Higher G2 structure height à be_er visibility •  Shorter interferometer length R2 à more (cone-‐beam) X-‐rays are detected Higher visibility + higher X-‐ray intensity = be_er sensi$vity to X-‐ray phase imaging ^1)/#";,1%'K;+6'+6*'=J&"#$%&',*+'2,*D'K;+6'MJO^0'*T/*";)*%+'
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Summary and Conclusion The set of graLngs composed of a source graLng, a π/2 phase graLng and an analyzer graLng for X-‐ray Talbot-‐Lau interferometry has been evaluated. Using a ccd-‐based X-‐ray detector, the maximum fringe visibility was 38%. Using an energy-‐resolving detector, the maximum fringe visibility was observed at 25 keV. The graLng set is therefor opLmum for a design energy of 25 keV. The visibility is lower but the sensiLvity to X-‐ray phase imaging is almost similar with the graLng set used in X-‐ray Talbot-‐Lau interferometry with the LCS X-‐ray source. The lower visibility is amributed to the bridge structures on the source graLng and the analyzer graLng.

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