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The ALARA principle—As Low As Reasonably Achievable—rests on three key factors: time, distance, and shielding. Maximizing distance from the source (inverse-square law) and interposing effective shielding (e.g., lead barriers) significantly reduce operator dose, making Option B correct. Rotating operators (Option A) spreads the exposure but does not reduce overall dose to the group, nor align with ALARA’s primary focus on minimizing unnecessary exposure. Wearing dosimeters only part-time (Option C) fails to capture true exposure and undermines monitoring. Increasing beam intensity to shorten time (Option D) reduces exposure time but dramatically increases dose rate, negating benefits and elevating hazard. CIH practice emphasizes engineering and administrative controls before reliance on PPE, and requires consistent dosimetry, training, area monitoring, and regulatory compliance under NRC or state authority.