The 'ALARA' principle in radiation protection stands for:

• A Absolute Limit of Acceptable Radiation Allowance
• B Adjusted Level of Annual Radiation Administration
• C As Low As Reasonably Achievable ✓
• D Allowable Limit for Acute Radiation Absorption

Explanation

ALARA — As Low As Reasonably Achievable — is the guiding principle of radiation protection established by ICRP. It mandates that doses to patients, staff, and the public be kept as low as reasonably achievable, taking economic and social factors into account. ALARA is based on the linear no-threshold (LNT) model which assumes no safe threshold for radiation-induced carcinogenesis. Practical implementation includes using the minimum effective dose, justification of every exposure, collimation, appropriate shielding, and dose optimisation for each examination. The three cardinal radiation protection principles are: Justification, Optimisation (ALARA), and Dose limitation.

Reference: Grainger & Allison's Diagnostic Radiology, 7th ed.

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Written and medically reviewed by the StethoPrep medical team.