Refer to Table 7.1.Diminishing returns set in with the ______ worker. 
Definitions:
Gamma Rays
Electromagnetic radiation of the highest frequency and energy, emitted from atomic nuclei during radioactive decay.
Background Radiation
The ionizing radiation present in the environment naturally from cosmic rays, radon gas, and other sources not due to deliberate human activity.
Radon
A radioactive, colorless, odorless noble gas occurring naturally as the decay product of uranium, posing health risks due to its ionizing radiation.
Background Radiation
The ubiquitous ionizing radiation present in the environment, originating from natural and artificial sources like cosmic rays, radon gas, and medical x-rays.
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