Final answer:
The Nuclear Regulatory Commission (NRC) issues recommendations for protection against radiation in the United States. They establish exposure limits and guidelines to ensure safety from ionizing radiation, using devices such as Geiger counters and dosimeters for monitoring.
Step-by-step explanation:
Within the United States, the agency that issues recommendations for protection against radiation is the Nuclear Regulatory Commission (NRC). They set limits on radiation doses for various groups, including nuclear workers and the general public. For example, the annual dose limit for nuclear workers is set at 5000 millirems, and for the public, the limit is 100 millirems. These limits help ensure that exposure to radiation is within safe levels to protect health. Dense materials like lead provide shielding to minimize exposure, and devices like Geiger counters, scintillators, and dosimeters are used to measure and monitor radiation levels.