RDS-5
{{Short description|Plutonium-based Soviet atomic bomb}}
The RDS-5 ({{langx|ru|РДС-5}}) was a plutonium based Soviet atomic bomb, probably using a hollow core.{{cite web|url=http://russianforces.org/blog/2012/10/interesting_document_on_soviet.shtml|title=Interesting document about Soviet nuclear tests in 1953|archiveurl=https://web.archive.org/web/20170519101448/http://russianforces.org/blog/2012/10/interesting_document_on_soviet.shtml|archivedate=May 19, 2017}} Two versions were made. The first version used 2 kg Pu-239 and was expected to yield 9.2 kilotons. The second version used only 0.8 kg Pu-239. {{cite web|url=http://isis-online.org/uploads/isis-reports/documents/North_Korea_Talk_April_28_2017_Final.pdf|title=North Korea's Nuclear Capabilities: A Fresh Look}}
Testing
The two versions of the RDS-5 were tested during a series of 3 tests on September 3, 8 and 10 1953 in the Semipalatinsk test site. The test on September 3 (Joe 6.{{cite web|url=http://www.johnstonsarchive.net/nuclear/tests/USSR-ntests1.html|title=Database of nuclear tests, USSR: part 1, 1949–1963}}) was probably of the 2 kg version and achieved a yield of 5.8 kilotons (compared to the expected 9.2 kiloton yield). The test on September 8 was probably of the 0.8 kg version and yielded 1.6 kilotons.