熱中性子ラジオグラフィ用-新規ＬｉＦシンチレータ、

Presentation on theme: "熱中性子ラジオグラフィ用-新規ＬｉＦシンチレータ、"— Presentation transcript:

1 熱中性子ラジオグラフィ用-新規ＬｉＦシンチレータ、
平成23年1月16日 KUR研究会 熱中性子ラジオグラフィ用-新規ＬｉＦシンチレータ、 および輝度向上フィルムの評価 ○飯倉 寛1，筒井 紀彰2，中村 龍也1，片桐 政樹1，呉田 昌俊1，　　 　久保 純3，松林 政仁1 　原子力機構1，秩父富士2，日産自動車3

2 新規LiFシンチレータの開発・評価 輝度アップシートの導入

3 新規LiFシンチレータの共同開発 Scintillation decay characteristics 従来品 AST社製
従来品　 　AST社製　 　化成オプトニクス製 　＜NRコンバータ＞ Scintillation decay characteristics Elapsed time (ms) Output voltage from PMT (V) 1 2 3 4 5 6 7 8 -0.04 -0.08 -0.12 -0.16 ZnS (Ag):Al/6Li ZnS (Ag):Cl/6Li ㈱秩父富士製 　＜ZNSLB-L300-Al-0510＞ ZnS/6 LiF/Inorganic-binder = 2:1:1 thickness : 300mm

4 Fast components Slow components
Sample Intensity Half-life Intensity Half-life After grow ratio (0-8 ms) periods (ms) (40-80 ms) periods (ms) (slow/fast) ZnS(Ag):Al/6Li (New scintillator) ZnS(Ag):Cl/ 6Li (AST) Comparison of the scintillation decay characteristics for thermal neutrons 4

5 Comparison of brightness (a) and MTF(b)
C-CCD camera C4880 (Hamamatsu) a 200mm lens (Nikon Micro-Nikkor, F=4.0) (a) (b) □　Conventional scintillator ○　New scintillator Exponential fit Brightness MTF □　Conventional scintillator ○　New scintillator Exposure time (second) Line Pairs/mm Conventional scintillator : 3.61LP/mm New scintillator : 3.04LP/mm 5

6 The designed Gd-resolution mask for neutron imaging
50 mm The designed Gd-resolution mask for neutron imaging (a) (b) 50 mm LP2.0mm 1.0 0.4, 0.8 0.6 0.2 0.3, 0.7 0.5, 0.9 1.5 3.0 f 4.0mm 2.0 0.8 4.0 LP2.0mm 1.5 1.2 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 6

7 A single frame neutron image of the Gd-resolution mask No.1 used the
high frame-rate Imaging system and the new scintillator. The frame rate of each image was 2000 (a) and 15000fps (b). FASTCAM-MAX 120K (Photron) I.I.（C9547MOD Hamamatsu, gain: min. 500 – max.990) NIKKOR 85mm lens (Nikon, F=1.4). (a) Gain 560 (b) Gain 750 200 pixels 7

8 Visualization of oil flow in a running car engine
Visualization of oil flow in a running car engine. (a) The appearance photograph of the engine used in the experiment. (b) A schematic illustration of the view area. (c) a single frame from the continuous neutron images at 2000fps inside an engine driven 1600 rotations per minutes. (a) (b) (c) 8

9 新規LiFシンチレータの開発・評価 輝度アップシートの導入 9

10 ＢＥＦ 住友3M株式会社HPより抜粋

11 BEF II 90/24 Prism pitch: 24 mm Prismatic Structure: 13 mm
Polyester Substrate: 127 mm Scintillator 4300 7100 10600 Silica glass BEF II 90/24 11

12 発光傾向（簡易的実測値より） BEF scintillator neutron neutron 12

13 Evaluation of the spatial resolution by using BEF.
The neutron transmission image of the Gd-resolution mask No.2 (a) withoutBEF, (b) with two BEF stacked perpendicularly None + two BEF (a) (b) 13

14 MTF using conventional scintillator with BEF.
The curves were approximated using the exponential function in order to calculate each 10% MTF. MTF Line Pairs/mm 10% of MTF none: LP/mm +BEF: LP/mm 14

15 1mm程度の分解能で十分なニーズであれば、さらなる高速動態撮像が可能に イメージングに限らず、また中性子に限らず、
New scintillator + BEF Conventional scintillator (a) (b) 0.9 sec 0.15 sec 1mm程度の分解能で十分なニーズであれば、さらなる高速動態撮像が可能に イメージングに限らず、また中性子に限らず、 シンチレータ等の発光をカメラ撮像するタイプのシステムであれば適用可能 15

16 ＴＮＲＦ　マシンタイム動向

17 ＪＲＲ－３　運転計画（予定）