London, Feb 15 (ANI): South Korean experts have said that they did not detect any radioactive isotopes from Pyongyang's nuclear test.
South Korea's Nuclear Safety and Security Commission said that eight samples had been analysed but nothing found.
Finding certain isotopes, xenon gases in particular, would help experts determine whether a plutonium or uranium-based device was used.
But experts said a well-contained test could yield no radioactive isotopes, the BBc reports.
According to the report, South Korean planes and ships were sent out immediately after the test to collect samples.
The commission said that no changes were recorded at 122 unmanned radiation monitoring systems across the country.
North Korea said on Tuesday that it had carried out an underground nuclear test, which it claimed involved a miniaturized, but more powerful device. (ANI)