Electrical detection of X-ray by using coplanar CNT thin-film electrodes on PEN substrate
| Autor: | Suzuki, Satoru, Matsuda, Hiroyuki, Ishikawa, Takahiro, Konishi, Teruaki, Hamano, Tsuyoshi, Ajiki, Hiroshi, Ohno, Yutaka, Hirao, Toshio |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Popis: | Radiation exposure to the eye lens has been a problem for a curer in the radiation therapy. Then, the transparent real-time dosimeter is required to measure the eye dose without disturbing their eyesight. In order to develop the transparent detector, transparency is necessary not only for the substrate but also for the electrode. Carbon nanotube is known to have transparency along with radiation tolerance [1]. In this study, we have fabricated the coplanar CNT thin-film electrodes on the PEN sheet and conducted the direct electrical detection of X-ray using these. Figure 1 shows the schematic structure of the device, where the distance between the CNT thin-film electrodes was 1 mm. The electrodes were patterned on the PEN substrate by splay coating of the single-walled CNT dispersion in IPA (0.2 wt%) using the metal mask. The device was placed inside of the stainless chamber under a vacuum of 1.0×10-2 Pa. X-ray with an effective energy of 83 keV was irradiated to the device from outside of the chamber at a bias voltage of 10 V. The current of the device was measured in real time during turning on and off of the irradiation at each dose rate. The current was confirmed to respond to the X-ray irradiation, as shown in Fig. 2. Moreover, the generated current increased linearly with the dose rate below 10.18 mGy/sec, as shown in Fig. 2, although it no longer changed linearly above 20.54 mGy/sec. It is thought that the generated current was the charges originated from the ionized residual gas inside the chamber, and that it did not reach the saturated region under the biased voltage. The CNT thin-film electrodes on the PEN sheet is applicable to the real-time transparent detector. Th e58th Fullerenes-Nanotubes-Graphene General Symposium |
| Databáze: | OpenAIRE |
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