| タイトル | Investigation of Deuterium Loaded Materials Subject to X-Ray Exposure |
| 本文（外部サイト） | http://hdl.handle.net/2060/20170002544 |
| 著者（英） | Pines, Vladimir; Becks, Michael D.; Daniels, Christopher C.; Steinetz, Bruce M.; Chait, Arnon; Hendricks, Robert C.; Pines, Marianna; Martin, Richard E.; Benyo, Theresa L.; Kamm, Tracy R.; Penney, Nicholas; Forsley, Lawrence P. |
| 著者所属（英） | NASA Glenn Research Center |
| 発行日 | 2017-02-01 |
| 言語 | eng |
| 内容記述 | Results are presented from an exploratory study involving x-ray irradiation of select deuterated materials. Titanium deuteride plus deuterated polyethylene, deuterated polyethylene alone, and for control, hydrogen-based polyethylene samples and nondeuterated titanium samples were exposed to x-ray irradiation. These samples were exposed to various energy levels from 65 to 280 kV with prescribed electron flux from 500 to 9000 A impinging on a tungsten braking target, with total exposure times ranging from 55 to 280 min. Gamma activity was measured using a high-purity germanium (HPGe) detector, and for all samples no gamma activity above background was detected. Alpha and beta activities were measured using a gas proportional counter, and for select samples beta activity was measured with a liquid scintillator spectrometer. The majority of the deuterated materials subjected to the microfocus x-ray irradiation exhibited postexposure beta activity above background and several showed short-lived alpha activity. The HPE and nondeuterated titanium control samples exposed to the x-ray irradiation showed no postexposure alpha or beta activities above background. Several of the samples (SL10A, SL16, SL17A) showed beta activity above background with a greater than 4 confidence level, months after exposure. Portions of SL10A, SL16, and SL17A samples were also scanned using a beta scintillator and found to have beta activity in the tritium energy band, continuing without noticeable decay for over 12 months. Beta scintillation investigation of as-received materials (before x-ray exposure) showed no beta activity in the tritium energy band, indicating the beta emitters were not in the starting materials. |
| NASA分類 | Nuclear Physics |
| レポートNO | GRC-E-DAA-TN31041
E-19039
NASA/TM-2015-218491/REV1 |
| 権利 | Copyright, Distribution as joint owner in the copyright |
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