Adsorption Behavior of Radionuclides on Ion-Exchange Resin from Cooling Water for the K2K Target and Magnetic Horns

Matsumura, Hiroshi; Kinoshita, Norikazu; Toyoda, Akihiro; Masumoto, K.; Bessho, Kotaro; Hagiwara, Masayuki; Yamanoi, Y.

doi:10.13182/nt168-979

Cited by 6 publications

(7 citation statements)

References 4 publications

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“…Appropriate treatment of radionuclides in water is essential for the safe operation of extremely high-energy and/or highintensity accelerator facilities; the operation of such facilities has been initiated in recent years, [1][2][3] while others are under construction or are in the design stage 4 in various regions of the world. [5][6][7][8][9][10][11] Beryllium-7 ( 7 Be: T1/2 = 53.1 d) 12 is one of the most dominant gamma-ray emitting nuclides produced in the cooling water at high-energy accelerator facilities. Our previous studies focused on analysis of the existing forms and behavior of 7 Be in various cooling water systems at high-energy proton accelerator facilities.…”

Section: Introductionmentioning

confidence: 99%

“…Our previous studies focused on analysis of the existing forms and behavior of 7 Be in various cooling water systems at high-energy proton accelerator facilities. [8][9][10][11] These investigations demonstrated that a part of 7 Be in the circulating water was present as fine colloids with diameters of several nanometers. The presence of colloidal species complicates the behavior of 7 Be in the water circulation system.…”

Section: Introductionmentioning

confidence: 99%

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Adsorption Behavior of Beryllium(II) on Copper-oxide Nanoparticles Dispersed in Water: A Model for 7Be Colloid Formation in the Cooling Water for Electromagnets at High-energy Accelerator Facilities

et al. 2014

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Adsorption Behavior of Beryllium(II) on Copper-oxide Nanoparticles Dispersed in Water: A Model for 7Be Colloid Formation in the Cooling Water for Electromagnets at High-energy Accelerator Facilities

et al. 2014

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“…In a previous study, we observed the weak retention of radio-colloids in a demineralizer in the case of the cooling-water system of the K2K target and magnetic horns at KEK in Japan. 2) Information on colloid formation of radionuclides in cooling water in high-energy accelerators is important to control the radioactivity. However, this phenomenon is not well understood owing to the lack of experimental data.…”

Section: K0"kpvtqfwevkqp 3 "mentioning

confidence: 99%

“…The scheme of sample separation after proton irradiation and the fraction names are shown in Hkiwtg" 5. After the separation, the activities of (1) radionuclides in the water, (2) radionuclides that formed ions and colloids in the water, (3) radionuclides in the Cu foil, and (4) 3 H in the water were determined. Details on how each activity was determined are described in the following subsections.…”

Section: "Rtqvqp"kttcfkcvkqp"mentioning

confidence: 99%

Colloid Formation Rates of Radionuclides Produced from Cu Foils in Water Bombarded with 120-GeV Protons

Matsumura

Sekimoto

Yashima

et al. 2012

Progress in Nuclear Science and Technology

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Radionuclide dissolution and radio-colloid formation in water under high-energy proton irradiation were investigated using a simple experimental apparatus. A bottle containing Cu foils immersed in pure water was irradiated with a 120-GeV proton beam. After irradiation, the radioactivities of various radionuclides in the water, Cu foil, and colloidal and ion forms that were separated by post-irradiation ultrafiltration of the water were measured by Ȗ-ray spectrometry. Cu. Although the radionuclides (except for 7 Be produced from O nuclei of water) were ejected from the Cu foils into the water by recoil, the Sc, Cr, and Fe isotopes were missing from the water. The colloid formation rates of the Mg, Mn, Co, Ni, and Cu isotopes were approximately 30%. The colloid formation rates of 7 Be, 24 Na, 42 K, and 43 K were 1.8̾3.9%. We conclude that the radionuclide dissolution depends on the physical process and that radionuclide behavior after ejection into the water strongly depends on elemental characteristics. The cross-section ratio of 3 H and 7 Be in the water was also measured.MG[YQTFU<"eqnnqkf." tcfkqpwenkfg." eqqnkpi" ycvgt." ceegngtcvqt."eqrrgt." rtqvqp." tgeqkn." vtkvkwo" K0"Kpvtqfwevkqp 3 "Cooling-water systems for high energy accelerators at J-PARC 1) in Japan are drained and refilled at regular intervals. Radionuclides such as 7 Be and 22 Na are produced in the cooling water or accelerator components by nuclear reactions. The radionuclides are then dissolved into the cooling water via physical and chemical processes. The radionuclides in the cooling water must be collected in demineralizers in order to reduce radioactivity below the control limit for discharge. The demineralizers adsorb ions on the ion-exchange resins. However, when radionuclides partially form radio-colloids, these radio-colloids are not efficiently captured by ion-exchange resins. This inefficient capture results in unsatisfactory recovery of the radioactivity by the demineralizers. In a previous study, we observed the weak retention of radio-colloids in a demineralizer in the case of the cooling-water system of the K2K target and magnetic horns at KEK in Japan. 2)Information on colloid formation of radionuclides in cooling water in high-energy accelerators is important to control the radioactivity. However, this phenomenon is not well understood owing to the lack of experimental data. Therefore, in this study, radionuclide dissolution and *Corresponding Author, E-mail: hiroshi.matsumura@kek.jp radio-colloid formation in water were investigated through the use of a simple experimental apparatus. Because cooling water in radiation fields of high-energy accelerators is often in contact with metallic copper, which is used to fabricate accelerator components, water-immersed Cu foils were irradiated with 120-GeV protons. The dissolution of radionuclides from Cu in water and the colloid formation rates of the radionuclides were clarified under these conditions.Tritium is not of concern for colloid formation in water. However, in the operation...

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“…It is important to know the behavior of radioactive and trace 7 Be in the cooling water. In recent studies, a large part of 7 Be was found to be captured by metal-oxide colloidal nanoparticles generated through corrosion of metal components in water (Itoh et al, 1998(Itoh et al, , 1999Matsumura et al, 2009;Bessho et al, 2010;Bessho et al, 2013;Matsumura et al, 2014;Bessho et al, 2015a;Bessho, Matsumura, Takahashi, & Masumoto, 2015b). On the other hand, the adsorption behavior of trace Be 2+ onto CuO nanoparticles in water was evaluated and the complexation constants between Be 2+ and the surface hydroxyl groups of CuO were determined (Bessho, Kanaya, Shimada, Katsuta, & Monjushiro, 2014).…”

Section: Introductionmentioning

confidence: 99%

Adsorption Behavior of Trace Beryllium (II) onto Metal Oxide Nanoparticles Dispersed in Water

Katsuta¹,

Kanaya²,

Bessho³

et al. 2017

IJC

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Radioactive trace 7 Be produced in cooling water systems for high-energy accelerators is known to be captured by metal-oxide colloidal nanoparticles generated through corrosion of metal components in water. This study is aimed at investigating the adsorption behavior of trace Be 2+ onto various oxide nanoparticles (Al 2 O 3 , SiO 2 , TiO 2 , Fe 2 O 3 , CoO, and CuO) dispersed in water at 25 °C in order to clarify the tendency and features of the interaction of Be 2+ with metal oxides. From pH dependence of the distribution ratio of Be 2+ between the nanoparticle phase and the aqueous solution phase, the surface complexation constants (β s,n ) have been determined for the reaction of Be 2+ with the hydroxyl groups on the oxide surface (>S−OH), i.e., Be

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Adsorption Behavior of Radionuclides on Ion-Exchange Resin from Cooling Water for the K2K Target and Magnetic Horns

Cited by 6 publications

References 4 publications

Adsorption Behavior of Beryllium(II) on Copper-oxide Nanoparticles Dispersed in Water: A Model for 7Be Colloid Formation in the Cooling Water for Electromagnets at High-energy Accelerator Facilities

Adsorption Behavior of Beryllium(II) on Copper-oxide Nanoparticles Dispersed in Water: A Model for 7Be Colloid Formation in the Cooling Water for Electromagnets at High-energy Accelerator Facilities

Colloid Formation Rates of Radionuclides Produced from Cu Foils in Water Bombarded with 120-GeV Protons

Adsorption Behavior of Trace Beryllium (II) onto Metal Oxide Nanoparticles Dispersed in Water

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