The character when upgrade database

hj all,
i have a problem is confuse,
the old oracle database, character set is UTF8, now i upgrade oracle DB from 8 to 10gr2, and my question:
if i set character set in the oracle DB 10gR2 is AL32UTF8 , after import dump file from old DB into DB 10GR2, so the data is lost or how effactive?
thanks all;

Both UTF8 and AL32UTF8 support the full character repertoire of Unicode. They only differ in the way of how supplementary characters (characters with Unicode codepoints above U+FFFF) are encoded. Assuming the original UTF8 data is valid, there should be no data loss when moving from UTF8 to AL32UTF8. If you upgrade the database to 10.2.0.4/10.2.0.5 first, you can use DMU to perform this character set migration and ensure any invalid data is detected and handled properly along the process.

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