Operation Greenhouse
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Operation Greenhouse was the fifth American nuclear test series, the second conducted in 1951 and the first to test thermonuclear weapons (hydrogen bombs). Conducted at the new Pacific Proving Ground, all of the devices were mounted in large steel towers, to simulate air bursts.
A number of target buildings, including bunkers, homes and factories were built on Mujinkarikku Island as test subjects.
The George explosion was the world’s first thermonuclear device; Item used a tritium booster.
| Test Name | Date | Location | Yield | Note |
|---|---|---|---|---|
| Dog | 8 April, 1951 | Pacific Proving Ground | 70 kilotons | |
| Easy | 21 April, 1951 | Pacific Proving Ground | 47 kilotons | |
| George | 9 May, 1951 | Pacific Proving Ground | 225 kilotons | |
| Item | 25 May, 1951 | Pacific Proving Ground | 45.5 kilotons |