Final answer:
The text does not specify a precise whole-body lifetime effective dose limit for radiation workers. Generally, doses under 100 mSv are low, 0.1 Sv to 1 Sv are moderate, and above 1 Sv are high. Radiation workers' limits are typically set within the low to moderate annual dose range.
Step-by-step explanation:
The limit for a radiation worker's whole-body lifetime effective dose is not clearly specified within the provided text. However, we can infer some information regarding safety levels of radiation exposure. Any dose less than 100 mSv (10 rem) is considered a low dose, a range of 0.1 Sv to 1 Sv (10 rem to 100 rem) is considered moderate, and a dose greater than 1 Sv (100 rem) is considered high.
The worldwide average radiation exposure from natural sources is about 3 mSv annually. Based on standard practices in radiation safety, yearly exposure limits for radiation workers often follow the linear hypothesis that assumes a direct proportionality of risk with the dose and are within the low to moderate range, often not exceeding a few tens of mSv per year, but the lifetime effective dose can vary based on national and international guidelines.