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Disinfection and sterilization



Remove fungi, larvae, insects and bacteria

The irradiation by gamma rays also protects distant remains of the past from degradation by eliminating fungi, larvae, insects and bacteria. Gamma rays from cobalt-60 are a tool for eliminating, without heating and with great reliability, fungi and parasites.

From a biological perspective, an intense gamma irradiation causes damages to DNA molecules, the seat of the genetic information of microorganisms. It interacts with the entire cell, causing the destruction of organisms. The radiation is very penetrating and radiating throughout the treated volume. It does not require the use of chemicals and can be made at ambient temperature and pressure. An object need not be removed from the package that was used to transport it. The mummies may remain in their coffin.

Momie de Ramsès II
The mummy of Pharaoh Ramses II was infested with larvae and fungi. Its irradiation was preceded by extensive testing, especially on other mummies, to verify its safety. The operation, now old, took place in 1977. It required transportation from the Cairo Museum to Saclay in France, back and forth, in a sterile bubble, of the mummy, its sarcophagus and its base.
CEA/Arc Nucléart

The simple disinfection, curative treatment, requires a relatively short-term irradiation of objects. The sterilization requires significantly more intense radiations. It is necessary to adjust the dose of radiation to the nature of the parasites that we wish destroy. Thus, disinfection lasts from one to several hours, so that sterilization requires twenty hours. It is necessary, for example, 500 Grays (Gy) to sterilize the wood-eating insects and 2000 Gy to kill the growth of certain fungi, 10 000 Gy or more for a sterilization.

This technique is very suitable to disinfect furniture, statues, ethnographic objects, mummies, etc....

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Disinfecting Effects