Gerboise Blanche

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Gerboise Blanche was the second test of the Gerboise series. This was a weapons development test designed to explore device miniaturization for a tactical missile.[1]

The test device, code named P1, was characterized by a bold simplification of construction. The device was cubic in form, and even used plywood as a material for it's outer casing. Hinges on the plywood would permit access to the explosives assembly and electronic equipment. The device was built to achieve a nuclear reaction and was not heavily instrumented as it was not designed to study theories of nuclear reactions or advanced bomb assemblies. The entire device weighed 2,840 lb. [3]

Due to the approaching summer in the Shara desert, the test was rather hastily arranged. Less than two months were given for preparations following General Ailleret's green light for the shot a few weeks after the Gerboise Bleue test. The predicted yield of less than 10 kilotons made it possible to fire the device on the surface instead of on a tower without much risk of a radiological problem.

Because it was decided to fire the device on the surface, the ground zero for the test was located approximately 15 kilometers south of the Gerboise Bleue location. The device itself was housed in a crude hut. Two air conditioned bunkers monitored various parameters, including radio control of the device and optical observation.



The Test
Code Name: Gerboise Blanche
Time and Date: 06:17 April 1, 1960 (GMT)
Location: Reggane, Algeria
Height: 1 meter (~3 feet)
Type: Surface Burst
Predicted Yield: <10 kilotons
Actual Yield: 6 kilotons (+/- 4 kilotons)

Firing station

Security was much lighter for this test as opposed to the Gerboiuse Bleue shot. Personal cameras were allowed to record the detonation with proper authorization, something which was not allowed for the first test. The control point, which consisted of five air conditioned huts, was located 6 miles from ground zero.

Gerboise Blanche was detonated at 06:17 on 1 April 1960 (GMT). General Ailleret personally initiated the firing of the device from the control point. The initial yield estimate of the explosion was 7 kilotons. Eventually it was determined the yield was roughly 6 kilotons (+/- 4 kilotons). [3]

The explosion produced a crater, approximately 13 meters deeps, which was later filled in.

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Principle References and Notes

1. French Nuclear Testing, 1960-1988, Burrows, Andrew S., Norris, Robert S., Arkin, William M., Cochran, Thomas B., Rebruary 1989, NRDC

2. Radiological Conditions at the Former French Nuclear Test Sites in Algeria: Preliminary Assessment and Recommendations, International Atomic Energy Agency, March 2005

3. L'opération GERBOISE BLANCHE (engin Pl, 1er avril 1960),Pierre Billaud, 29 June 1989, Souvenirs d'un pionnier de l'armement nucléaire français.

4. Histoire des Essais Nucléaires Français : Du Désert de la Soif à l'île du Grand Secret., Yves et Ada Rémy, ECPA, 3 July 1998


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