Talk:Japanese nuclear weapon program/@comment-78.148.183.240-20160109133137

 Ni-Go project.

                From  ‘The Making of the Atomic Bomb, R. Rhodes’.

‘Significantly missing from the November 17 conference report is any mention of measurable separation of U235 from U238’.

      Translation of the Japanese Tonizo document of the meeting on 17th November 1943.

Present; Lt. Gen. Nobu-uji,  Dr. Yoshio Nishina,   Ishida ( gishi / engineer ?)

The sample from the thermal diffusion column was reduced to uranium oxide and with a natural sample irradiated together with thermalized neutrons using the cyclotron. Only U235 undergoes fission with thermal neutrons. The ratio of the resultant radioactivity is a measure of the enrichment.

Nishina;   “  Kayonishita U235 ganyu ritsu 0.7%, yaku 10% tado ni naru.”

Thus / in this way, the U235 which is initially 0.7%, enriched to about 10%.

<p class="MsoNormal"><span style="font-size:12.0pt;line-height:107%;font-family: "TimesNewRoman",serif">“ Karui UF6 wo sarani joryu noshuku suru tame, bunri-to wo sarani ikki kensetsu-cho de aru”.

<p class="MsoNormal"><span style="font-size:12.0pt;line-height:107%;font-family: "TimesNewRoman",serif">In order to further enrich the light uranium hexafluoride, a further separating tower unit is in the middle of being built.

<p class="MsoNormal"><span style="font-size:12.0pt;line-height:107%;font-family: "TimesNewRoman",serif">

<p class="MsoNormal"><span style="font-size:12.0pt;line-height:107%;font-family: "TimesNewRoman",serif">Both these Clusius-Dickel thermal diffusion columns were destroyed during a bombing raid the following April.