Béryl incident
The "Béryl incident" was a French nuclear test, conducted on May 1, 1962, during which nine soldiers of the 621st Groupe d'Armes Spéciales unit were heavily contaminated by radioactivity.
The test took place at In Eker, Algeria, then a French department, and was designed as an underground shaft test. Due to improper sealing of the shaft, radioactive rock and dust were released into the atmosphere. The soldiers were exposed to as much as 600 mSv. As many as 100 additional personnel were exposed to lower levels of radiation, estimated at about 50 mSv, when the radioactive cloud produced by the blast passed over the command post, due to an unexpected change in wind direction. Among those exposed were several French government officials, including French Defense Minister Pierre Messmer and Gaston Palewski.
Location
The site chosen for the test was In Eker, around 150 km north of Tamanrasset. The Taourirt Tan Afella mountain, one of the granite Hoggar Mountains, after having been the object of geotechnical surveys, was kept as a test site. The site was laid out from 1961 onward. A base called DAM Oasis 1, then Oasis 2, was then built to not be visible from the road a few miles east of Tan Affela.Description of the accident
Failed containment
France, having had to abandon aerial tests and replace them with less-polluting underground tests, opted for underground testing in marine or desert zones. The Saharan test sites were produced “in galleries”, those having been horizontally excavated in the Tan Afella on the site In Eker.This type of “shooting gallery” was dug to end in a spiral shape. On the one hand, this shape of tunnel seriously weakened the ground at this point, and on the other hand, it dampened the expulsion of gases, of dust, and of lava produced by the vitrification of the soil. According to calculations by engineers, due to these two factors, the gallery went to the point of collapse and sealing. It was also closed by a concrete plug. Actually, four highly resistant steel doors closed the gallery at different covered levels in order to seal the shaft with polyurethane foam. These measures were used to ensure the greatest possible containment of radioactivity, which justified inviting so many “officials” to attend the test.
A radioactive cloud escaping
On May 1, 1962, during the second subterranean test, the spiral did not seem to collapse early enough and the plug had been pulverized. The door closing the gallery at the end was projected several tens of meters letting out a cloud of radioactive gas and particles outside the test site. A fraction of the radioactivity was expelled with the gas, lava, and slag. The lava solidified on the floor of the gallery, but the particulates and the gaseous products formed a cloud which culminated at about 2,600 m of altitude, leading to radioactive fallout detectable for a few hundred kilometers downwind from the site.According to the witness Pierre Messmer, some seconds after the ground trembling caused by the explosion, the spectators saw “a kind of gigantic blowtorch flame that started exactly horizontal in our direction… This gigantic flame was extinguished rather quickly and was followed by the release of a cloud which was ochre-coloured at first, but then quickly turned black.”
Recordings from devices measuring radioactivity were immediately put under military secrecy.
Contamination of spectators
The radioactive cloud was pushed by the wind to the east, with in this direction, significant atmospheric contamination measured up to around 150 kilometers. A certain number of dignitaries, including two ministers attended the tests, as well as several military and civilians.Pierre Messmer rushed to leave the same evening after decontamination. It would have been more dignified for the chief of the armies to manage the accident. He denied any contamination.
Panicked Atomic Energy Commission personnel washed themselves frantically in an effort to decontaminate themselves. The rush caused by the haste of the participants' decontamination gave rise to little worthy occurrences on the part of some officials after the testimony of Sodeteg personnel.
Closing of the tunnel
Subsequently, the outlet of the tunnel was covered with concrete for lack of a better means of decontamination.Health consequences
Gaston Palewski would die of leukemia 22 years later, persuaded, according to Pierre Messmer, that this cancer was caused by the accident. Messmer also died of cancer, but at a very advanced age, without being able to link the cancer to this incident. According to official reports available, most military only received external radiation. However, no information is available on the health of the Saharan civilian Tuareg population.Health effects according to official reports
Nine people situated in an isolated post crossed the contamination zone after having, at least temporarily, removed their masks. Upon return to their base camp, they became the object of clinical hematological and radiological monitoring. The committed dosages received by these people had been evaluated at around 600 mSv. These nine people were then transported to the Percy Military Training Hospital in Clamart for monitoring and additional radiobiological examinations. The monitoring of these nine did not reveal any specific pathology. Trials at Béryl say health consequences are possible for the fifteen heavily contaminated people. Estimates give the following figures:| Number of persons | Dosage |
9 | 600 mSv |
15 | > 200 mSv |
100 | > 50 mSv |
~240 | < 2.5 mSv |
The equivalent dosages which would have been received by the population present at the moment of fallout and who would have then stayed in the same spot had been evaluated. The nomadic populations of Kel Tohra, the most exposed would thus have received a similar cumulative dose up to 2.5 mSv.
The number of contaminated in Algeria remains unknown to this day, and the possible contamination of the food chain following the re-flight and/ or local concentration of radionuclides have not been the object of study. The radioactive cloud formed headed due east. In this direction, atmospheric contamination was significant at around 150 km, the distance over which there was no settled Saharan population.
In film
The docudrama Vive la bombe!, directed by Jean-Pierre Sinapi in 2006, recounted this event through the experiences of military men irradiated. It was broadcast on Arte on March 16, 2007, then on France 2 on April 28, 2009, and again on Arte on February 10, 2010.The documentary Gerboise bleue, directed by Djamel Ouahad and released in 2009, widely mentions this incident, in particular with the harrowing testimony from a survivor.
Indirect references to this incident and the related Blue Jerboa test explosions appear in the Netflix fictional comedy produced by Arte called A Very Secret Service in Season 2.
In literature
The book Les Irradiés de Béryl is the collective account of five authors published by Éditions Thaddée in 2010.The novel L'affinité des traces by Gérald Tenenbaum discusses the accident through the eyes of a young secretary employed on the base, who then chooses to live with the Tuareg.