The purpose of protection is to prevent harmful non-random effects and limit the probability of occurrence of random effects to an acceptable level. To achieve this goal, we must abide by the following principles.
(1) The legitimation of radiation practice, radiation has hindered health, why use radioactive instruments? The key reason is that it can bring enormous benefits. Only when the annual benefits of a radiation practice are much greater than the costs (harm to people and the environment, etc.), can the practice be considered legitimate.
(2) The optimization of radiation protection, in order to avoid unnecessary irradiation, must pay a certain price, take protective measures, the lower the level of irradiation, the greater the cost. Therefore, the benefits and costs of radiation practice and the level of dose achieved should be taken into account. Find an optimal solution, that is, the greatest benefits. It is not the lower the dose level, the better the cost is the smallest and the dose can be reduced to a reasonable low level. If the dose is reduced blindly, it will not pay off.
(3) Individual dose equivalent limits
In the implementation of the two principles of justification and optimization, it is necessary to ensure that the individual dose does not exceed the prescribed limit at the same time.
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