Mana is the substance that makes a human capable of performing spells. In the magitocracy, mages rule the kingdom. An individual capable of magic must learn to focus his power, solidifying and controlling the Mana in order to use it. Welding Mana in this way takes years of study. Mages are of various power levels, those who master their Mana welding are among the strongest mages in society.
However, there are areas of the world in which Mana roams free and unbound by humans. This mana is unrestrained and leads to these areas being high in radiation. This could be deadly to those in the vicinity, as it can have debilitating effects, mutations, and even death.
When the body dies, the gases within escape as it breaks down. This releases the Mana from the body. This can be a problem, for Mana unbound from a living body becomes radioactive, becoming a danger for those in the surrounding area. Burial would not stop this Mana release, and cremation would accelerate the process.
How can this scenario be prevented?