The letters ALARA stand for

as low as reasonable achievable.
after lower accumulation radiation aggregation.
as low as reasonably accumulated.
as latent as responsive accumulation.

as low as reasonable achievable.

Rationale: as low as reasonably achievable – All dental offices and those using radiography equipment must adopt the philosophy of ALARA, which is an acronym for "as low as reasonably achievable.". This means that the lowest dosage of radiation exposure to the patient and operator while achieving a diagnostic radiograph is the main objective.