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Detect and devalue: Nuclear engineers work on plan to thwart poaching of rhinoceros horns


The South African white rhino can grow to the weight of an average car — roughly 2.5 tons — so one might believe it does not have many natural predators. However, humans have proven to be the animal’s largest existential threat.

In 2021, 451 rhinos were poached for their horns on public or private land, according to the Department of Forestry, Fisheries and Environment of the Republic of South Africa.

An innovative collaboration between the University of the Witwatersrand, Johannesburg, in South Africa, and the Department of Nuclear Engineering at Texas A&M University may be the answer to curb rhino horn poaching once and for all.

Texas A&M nuclear engineering graduate student Jordan Hillis and Texas A&M nuclear engineering associate professor Craig Marianno partnered with James Larkin from Wits.

Together, they are discovering how to use nuclear science to devalue rhino horns for poachers and detect poached horns at ports of entry — similar to how nuclear explosive devices are detected.

Larkin began The Rhisotope Project in 2021 to find a way to safely insert nuclear material known as radioisotopes into a rhino’s horn. The radioisotopes would make the horn detectable to port monitors when poachers attempt to smuggle them across borders. To figure out how to do it safely, he reached out across the pond to Texas A&M, where Hillis and Marianno got right to work.

Hillis earned her bachelor’s degree in nuclear engineering in 2021 and returned as a graduate student focusing on health physics. She will perform sensitivity analyses with hand calculations and computer modeling as part of an independent study to verify the project’s safety. Sensitivity analyses study the overall uncertainty of a mathematical model while helping pinpoint the most important issues in a decision. 

“Once I’ve gotten my hand calculations of the radiation dose rates from the horn’s model and found that they are ideal, I’ll take those and confirm them in the computer simulations. The hope is that my hand calculations of the dose rates match the computational results,” Hillis said.