Commissioning of the tritium process laboratory at the JAERI

Naruse, Yuji; Matsuda, Yuji; Tanaka, K.; Konishi, Satoshi

doi:10.1016/0920-3796(89)90053-7

Cited by 10 publications

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“…In the nuclear fusion process, for example in a hydrogen isotopes separation system cu>, the detection limit of tritium (T 2 ) concentration is considered to be less than 10 ppm, which is equal to a partial pressure of 1 Pa at room temperature. Then radioactivity is as high as 2.6x10 4 Bq/cm• per 1 ppm T 2 gas. So that the ionization current is presumed to be sufficiently large enough to detect, and a small volume ionization chamber should be adopted.…”

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confidence: 96%

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High Concentration Tritium Gas Measurement with Small Volume Ionization Chambers for Fusion Fuel Gas Monitors

Uda

Okuno

Matsuda

et al. 1991

Journal of Nuclear Science and Technology

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To apply ionization chambers to fusion fuel gas processing systems, high concentration tritium gas was experimentally measured with small volume 0.16 and 21.6 cm 3 ionization chambers. From plateau curves, the optimum electric field strength was obtained as 100-200 V /em. Detection efficiency was confirmed as dependent on the ionization ability of the filled gas, and moreover on its stopping power, because when the range of the {3-rays was shortened, the probability of energy loss by collisions with the electrode and chamber wall increased. Loss of ions by recombination was prevented by using a small volume ionization chamber. For example the 0.16 em• ionization chamber gave measurements with linearity to above 40% tritium gas. After the tritium gas measurements, the concentration levels inside the chamber were estimated from their memory currents. Although more than 1/4,000 of the maximum current was observed as a memory effect, the smaller ionization chamber gave a smaller memory effect.

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confidence: 96%

“…For measurements of high concentration tritium in fuel gas processing, an ionization chamber is considered to be one useful detection methodCl>-<•>, and it has been used in tritium process development facilities, for example in the Tritium Process Laboratory (TPL)< 4 …”

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confidence: 99%