Titanate ceramics with pyrochlore structure as a matrix for immobilization of excess weapons-grade plutonium: I. Radiation resistance

被引：0

作者：

Volkov Yu.F. ^{[1
]}

Tomilin S.V. ^{[1
]}

Lukinykh A.N. ^{[1
]}

Lizin A.A. ^{[1
]}

Elesin A.A. ^{[1
]}

Yakovenko A.G. ^{[1
]}

Spiryakov V.I. ^{[1
]}

Bychkov A.V. ^{[1
]}

Jardine L.J. ^{[2
]}

机构：

[1] Res. Institute of Nuclear Reactors, Russian State Scientific Center, Dimitrovgrad, ul'Yanovsk Oblast, R.

[2] Lawrence Livermore Natl. Laboratory, Livermore, The United States

来源：

Radiochemistry | 2004年 / 46卷 / 4期

关键词：

Immobilization; Plutonium; Waste Disposal; Structural Transformation; Radiation Damage;

D O I：

10.1023/B:RACH.0000039111.16794.e8

中图分类号：

学科分类号：

摘要：

Radiation resistance of titanate ceramics of a complex cationic composition with the pyrochlore structure, containing U, Pu, Ca, Gd, and Hf, is studied from the standpoint of its use for immobilization of excess weapons-grade plutonium. To induce radiation damage of the host matrix, isomorphic incorporation of 238Pu (t 1/2 = 87.7 years) at the ceramics preparation stage was used. Radiation-induced structural transformations in the ceramics were monitored by X-ray diffraction up to the radiation doses providing full amorphization of the structure. The critical damaging (amorphization) dose for the ceramics studied is estimated to be about 120 ×10 23 α-events m -3. Taking into account the planned concentration of incorporated 239Pu in the ceramics at a level of 10 wt %, the lower limit of amorphization time of the actual ceramics under conditions of a waste disposal site is estimated to be about 360 years.

引用

页码：351 / 357

页数：6

共 21 条

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