On Monday, August 6, 1945, at 8:15 AM, the Atomic Bomb “Little Boy” was dropped on Hiroshima by an American B-29 bomber, directly killing an estimated 80,000 people. By the end of the year, injury and radiation had dramatically increased the total amount of casualties.
This year Yoko Ono was in Hiroshima at a memorial and spoke a few words to the assembled crowd.
…With the warning we’ve received from this tragedy,
and the belief and the efforts of all of us on this globe,
We will leave the world full of old and dangerous human habits
and bring the future new world with the speed of lightning.
Well, that’s what we should be doing. And we can…
Hiroshima Day, 6 August 2011
However, would Yoko have prepared the same speech if she had known that enough Uranium-235 had been shipped to Tokyo only 5 days earlier to construct over 14 nuclear weapons?
The Little Boy gun type atomic bomb dropped on Hiroshima on August 6, 1945 was fueled by highly enriched uranium with a large tamper. The nominal spherical critical mass for an untampered 235U nuclear weapon is 56 kg, a sphere 17.32 cm (6.8″) in diameter. The required material must be 85 percent or more of 235U and is known as weapons grade Uranium, though for a crude, inefficient weapon 20 percent is sufficient (called weapon(s)-usable).
Bare sphere: 56 kg 11 kg
Thick Tamper: 15 kg 5 kg
Director, Division of Nuclear Security
Office of Nuclear Security and Incident Response
U.S. Nuclear Regulatory Commission
Washington, DC 20555
In accordance with the Convention on the Physical Protection of Nuclear Material and the NRC final rule of March 26, 2003, Transport Logistics International hereby makes the following notification of upcoming shipment:
Physical Description:3 x 20’ Flatracks of enriched UF6, contained in 11 type AF Packages
Max. Enrichment: 5 %
Gross Weight: 44,747 Kg Net Weight: 24,216 Kg as UF6
U-Weight: 16,368.280 Kg U235 Weight: 786.939 Kg
Mode(s) of Transport: As Above.
Transfer Points: From USEC in Paducah, KY to the port of Oakland for loading on MOL ENDEAVOR to Tokyo.
Routes to be used: U.S. Inland Routing will be in accordance with 49 CFR 397.101
ETD Paducah July 14, 2011 1100 hrs
ETD Oakland July 22, 2011 1700 hrs
ETA Tokyo August 1, 2011 0800 hrs
The shipper certifies that the necessary arrangements have been made for pick-up and delivery of the above material and that
the consignee has agreed to receive it. Both consignee and consignor have also agreed to the shipment dates as specified.