plural control rods
Definition of control rod
: a rod of a neutron-absorbing material (such as boron carbide) used to regulate the rate of nuclear fission in a reactor
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“Control rod.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/control%20rod. Accessed 28 Jan. 2022.
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Time Traveler for control rod
The first known use of control rod was in 1906
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