An acute dose is a radiation exposure delivered in a very short time frame. Since the scenario specifies a dose delivered within a single 24-hour period or less, it fits the definition of an acute dose. The other options describe longer-duration exposures (within 48 hours or over several days), which are not considered acute. A dose delivered in minutes is also a short-term exposure, but the standard term used for this kind of rapid, short-duration exposure is acute dose.

In a secondary investigation, you look for damage that isn’t obviously visible. Hidden damage can be lurking behind panels, inside compartments, or within structural and system interfaces, and it can worsen if not found and addressed. This approach is best because it ensures a complete picture of safety and readiness. By systematically inspecting for unseen or hidden damage—checking for moisture, corrosion, delamination, leaks, heat damage, cracks, and electrical issues, and using appropriate tools—you can identify problems that would otherwise go undetected. Documenting these findings and reporting them promptly allows proper repair planning and prevents surprises later. Reporting only what you can see misses critical issues, and ignoring non-obvious damage isn’t safe or prudent for maintaining integrity and safety. Focus on uncovering and reporting the unseen so the crew can address all hazards and restore the ship to full capability.

Cleaning after the chalk test requires a soft, non-abrasive wipe to remove chalk dust and any fine residue without scratching the knife edge or damaging the silicone gasket. A rag or cloth fits this need perfectly because it is gentle on delicate surfaces while effectively picking up powder and debris. Using a rag keeps the surfaces clean and dry, which is important for accurately inspecting the joint on the next step. Water can smear chalk and introduce moisture, which isn’t ideal for dry inspection, and alcohol, while a solvent, can affect gasket materials or leave residues. Sandpaper would obviously gouge or abrade the edge and gasket.

The inner protection is a cotton glove liner. This cotton layer sits between your skin and the outer protective glove, delivering comfort and moisture management so the outer chemical-protective glove can be worn without causing irritation. Cotton is chosen because it’s breathable, absorbs sweat, and eases donning and doffing. Latex, nylon, and leather aren’t used for this inner layer due to compatibility issues (allergies with latex) and poorer comfort or moisture handling under the outer glove.