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We have been developing neutron color image intensifiers (hereafter abbreviated as NCIIs) for static neutron sources. With the recent progress of high power pulsed neutron sources, needs for energy selective neutron imaging are increasing. To fulfil suchrequirements, we have newly developed NCIIs having a high-speed blanking (gating) circuit and an...
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... basic configuration of the neutron radiography using NCII is shown in Fig. 1. NCII is installed in a neutron irradiation room in Hokkaido University LINAC. Samples are set in front of the input screen of NCII, and are irradiated with the collimated neutron beam. NCII is remotely operated from the control room outside the shielding wall, by monitoring PC informations and camera images. NCII, the main part of the ...
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... are two types of output phosphor screen of NCII, the first is a conventional high-intensity and high sensitivity type shown in Fig.2 [o-1], and the second is a short-persistence type shown in Fig.2 [o-2] having an improved time resolution corresponding to the time-of-flight measurement characteristics at pulsed neutron ...
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... and [o-2] short-persistence type has about 7 times higher sensitivity than the NE426 scintilator. However, it has about 60% brightness of the [o-1] high-intensity and high sensitivity type despite its identical [i-2] input layer. Figure 9 shows the contrast adjusted images after shading correction using background images, whereas For comparison, Fig. 10 shows NCII images taken previously by 7R irradiation port of JRR3 reactor where L/D is higher than 170. The view field of the 4-inch NCII was reduced to 2 inches by the internal electron lens, and the similar high-definition camera of 3.5m pixel resolution was used. As shown in Fig. 10, the minimum groove of 12.5m SI indicator is ...
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... correction using background images, whereas For comparison, Fig. 10 shows NCII images taken previously by 7R irradiation port of JRR3 reactor where L/D is higher than 170. The view field of the 4-inch NCII was reduced to 2 inches by the internal electron lens, and the similar high-definition camera of 3.5m pixel resolution was used. As shown in Fig. 10, the minimum groove of 12.5m SI indicator is clearly ...
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