1. Introduction

From the view point of performance assessment for disposal of radioactive waste, it is important to assess the migration behavior of radioactive elements in buffer material (the engineered barrier) and rocks (the natural barrier). In performance assessment calculations, the distribution coefficient of radionuclides (Kd) for buffer material and rocks is a very important parameter. The JAEA-Sorption Database System (JAEA-SDB) is compilations of sorption Kd data from published literatures.

2. Elements and solids included in database

	At present, JAEA-SDB includes Kd data for 58 elements; 22 elements selected as key radionuclides in the performance assessment for HLW disposal, and additional 36 elements related to TRU waste disposal, etc. Solids included in the database are the major types of rocks, clays and others (minerals / oxides etc.) Also, Kd values for soil and/or cement material are included if any reasonable data existed.
		22 key elements for HLW Ni, Se, Zr, Nb, Tc, Pd, Sn, Sb, Cs, Sm, Pb, Bi, Po, Ra, Ac, Th, Pa, U, Np, Pu, Am, Cm Additional elements Ag, Ce, Co, Eu, Fe, Sr etc.

3. Date extraction

At present, JAEA-SDB includes Kd data and related information extracted from articles, reports, etc. which were published untilthrough the year 2009. The present JAEA-SDB includes more than 46,000 Kd data from about 670 source documents. Kd data from the OECD / NEA sorption database (Ticknor and Ruegger, 1989). were also included in JAEA-SDB. For details of revision history and related documentations for JAEA-SDB development, please refer to the revision history notes of the JAEA-SDB.

4. Database contents

Data-table of JAEA-SDB includes more than 19 types of data and information which are important in describing experimental conditions.

	These 19 parameters are ;
	• elements		• redox	• solid face
	• L/S (liquid to solid ratio)		• water type	• initial and final pH
	• initial and final Eh		• atm/redox condition	• initial tracer concentration
	• temperature		• contact time	• separation method
	• Kd		• error	• type of information
	• replication		• reference	• additional information
	• QA information	=> Criteria-I: Completeness of documentation => Criteria-II: Quality of data => Criteria-III: Consistency of data

5. Database systems

	In the JAEA-SDB system, there exists two types of systems ;
		• JAEA-SDB Web version enables you to use directly access the database through the web browser over the internet.  • JAEA-SDB Access 2002 version enables you to download and use the database with the Microsoft Access 2002 in Windows computers.

6. References

Please refer to the following references for details of database contents and its application. The users are requested to cite these references if any users publish research works conducted by using JAEA-SDB. T. Suyama and Y. Tachi : “Development of Sorption Database (JAEA-SDB): Update of Sorption Data Including Soil and Cement System” , JAEA-Data/Code 2011-022 (2012). Y. Tachi et al. : “Development of JAEA Sorption Database (JAEA-SDB): Update of Data Evaluation Functions and Sorption/QA Data” , JAEA-Data/Code 2010-031 (2011). Y. Tachi et al. : “Development of the Sorption and Diffusion Database System for Safety Assessment of Geological Disposal” , JAEA-Data/Code 2008-034 (2009).    (for details of QA evaluation) Y. Tachi et al. : “Development of JAEA Sorption Database (JAEA-SDB): Update of Data Evaluation Functions and Sorption/QA Data” , JAEA-Data/Code 2010-031 (2011). "T. Suyama et al. : “Evaluating and Categorizing the Reliability of Distribution Coefficient Values in the Sorption Database (4)” , JAEA-Data/Code 2010-026 (2011). M. Ochs et al. : “Evaluating and Categorizing the Reliability of Distribution Coefficient Values in the Sorption Database (3)” , JAEA-Data/Code 2009-021 (2010). Y. Saito et al. : “Evaluating and Categorizing the Reliability of Distribution Coefficient Values in the Sorption Database (2)” , JAEA-Technology 2008-018 (2008). M. Ochs et al. : “Evaluating and Categorizing the Reliability of Distribution Coefficient Values in the Sorption Database” , JAEA-Technology 2007-011 (2007).    (for details of data sources) T. Suyama and Y. Tachi : “Development of Sorption Database (JAEA-SDB): Update of Sorption Data Including Soil and Cement System” , JAEA-Data/Code 2011-022 (2012). Y. Tachi et al. : “Development of JAEA Sorption Database (JAEA-SDB): Update of Data Evaluation Functions and Sorption/QA Data” , JAEA-Data/Code 2010-031 (2011).  etc.