不详;
Radiochemistry;
Research;
Laboratory,;
Faculty;
of;
Scienc:;
Shizuoka;
University,;
Shizuoka,;
Japan;
Radioisotope;
Center.;
The;
Univensity;
of;
Tokyo,;
Tokyo,;
Japan;
National;
Institute;
for;
Fusion;
Science,;
Toki-Shi,;
Japan;