The phrase "as directed by RHP, DHP or RPC" appears in relation to:

• A. Bioassay And WBC Count
• B. Radiopharmaceutical Administration
• C. Dosimeter Color Coding
• D. Hazard Signage

Answer: (A)

The key idea here is internal monitoring and safety oversight in radiation use. When there’s potential internal exposure from radiopharmaceuticals or other radioactive work, specialized checks such as bioassay (measuring radioactive material excreted from the body) and a blood test like a WBC count are used to assess that exposure and any hematologic effect. The phrase “as directed by RHP, DHP or RPC” signals that these tests should be ordered and carried out under the guidance of qualified radiation safety staff or the radiation protection coordinator. They determine when a bioassay or hematology test is appropriate, how often to repeat it, and what actions to take based on the results.

Other options involve different areas (how a radiopharmaceutical is given, how signs are displayed, or how dosimeters are color-coded) that aren’t about directing internal monitoring tests, so they don’t align as well with who controls these specific assessments.