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Keywords = tantalum hydride

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9 pages, 1956 KiB  
Article
Feasibility Study on Production of High-Purity Rhenium-185 by Nuclear Transmutation of Natural Tantalum
by Yuki Tanoue, Tsugio Yokoyama and Masaki Ozawa
J. Nucl. Eng. 2023, 4(3), 625-633; https://doi.org/10.3390/jne4030039 - 1 Sep 2023
Cited by 1 | Viewed by 2305
Abstract
Rhenium-186 (Re-186) has attracted attention as a medical isotope. The feasibility of producing Re-185, the raw material for Re-186, using a fast reactor was evaluated using a continuous energy Monte Carlo code. The irradiation of natural tantalum (Ta) in the fast reactor can [...] Read more.
Rhenium-186 (Re-186) has attracted attention as a medical isotope. The feasibility of producing Re-185, the raw material for Re-186, using a fast reactor was evaluated using a continuous energy Monte Carlo code. The irradiation of natural tantalum (Ta) in the fast reactor can produce Re-185 with an isotopic purity of 99%. A two-step irradiation process with different moderators was found to improve the production rate of Re-185. Specifically, this can be achieved by using zirconium hydride (ZrH1.7) as a moderator in the first transmutation process from natural Ta to tungsten (W), and then zirconium deuteride (ZrD1.7) as a moderator in the second transmutation process from W to Re-185. Due to the two-step irradiation, the production rate of Re-185 from Ta can be increased up to a maximum of 470 times compared with irradiation without a moderator, and 2.3 g of Re-185 can be obtained from 1571 g of Ta in 1 year of irradiation. The proposed isotope production method is a new method that is different from the conventional electromagnetic enrichment process. Full article
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8 pages, 1615 KiB  
Article
Pressure–Temperature Phase Diagram of Ta-H System up to 9 GPa and 600 °C
by Hiroyuki Saitoh, Shigeyuki Takagi, Toyoto Sato and Shin-ichi Orimo
Appl. Sci. 2021, 11(15), 6719; https://doi.org/10.3390/app11156719 - 22 Jul 2021
Cited by 3 | Viewed by 2397
Abstract
High-pressure hydrogenation behaviors of pure metals have not been investigated extensively, although intense research of hydrogenation reactions under high pressure has been conducted to find novel functional hydrides. The former provides us with valuable information for the high-pressure synthesis of novel functional hydrides. [...] Read more.
High-pressure hydrogenation behaviors of pure metals have not been investigated extensively, although intense research of hydrogenation reactions under high pressure has been conducted to find novel functional hydrides. The former provides us with valuable information for the high-pressure synthesis of novel functional hydrides. A pressure–temperature phase diagram of the Ta–H system has been determined using the in situ synchrotron radiation X-ray diffraction technique below 9 GPa and 600 °C in this study. At room temperature, the phase boundary obtained between distorted bcc TaH~1 and hcp TaH~2 was consistent with the previously reported transition pressure. The experimentally obtained Clapeyron slope can be explained via the entropy change caused by hydrogen evolution from TaH~2. Full article
(This article belongs to the Special Issue New Vistas in Metal Hydrides and Related Materials)
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