A border force investigation into the import of uranium and plutonium by a “science nerd” to his parents’ apartment was a ridiculous over-reaction, his lawyer has said.

Emmanuel Lidden, 24, admitted breaching nuclear non-proliferation laws by ordering various radioactive samples through the internet.

His motive: collecting all elements of the periodic table, just like billionaire Bill Gates.

The package’s delivery sparked a major hazmat incident as Australian Border Force officials, firefighters, police and paramedics all combed the scene in August 2023.

But almost two years on, a judge on Friday spared Lidden a conviction and allowed him to walk from Sydney’s Downing Centre District Court on a two-year good behaviour bond.

While his actions were criminal, Judge Leonie Flannery found that the 24-year-old had mental health issues and displayed no malicious intent.

Speaking to AAP after the sentencing, defence lawyer John Sutton said his client was relieved.

But the solicitor criticised Border Force for the way it had gone after the young man.

“It was an awful investigation for a whole range of reasons,” Sutton said.

Officers over-reacted by storming Lidden’s Sydney home in hazmat suits when the amounts ordered were minuscule and harmless, he told AAP.

“We could eat (them) and we’d still be perfectly fine,” he said.

“I’ve been contacted from scientists all around the world saying this is ridiculous.”

Prosecutors should have also questioned whether pursuing the case against Lidden in court was really in the public interest, Sutton said.

In a statement, ABF superintendent James Ryan called the multi-agency investigation against Lidden “extremely complex and sensitive”.

“The ABF remains committed to protecting the Australian community from all threats which can cross the border,” he said.

“I hope this example can be used as an education tool for people to be aware of the regulatory frameworks around what can and cannot be imported into Australia.”

Lidden is the first person prosecuted under Australia’s non-proliferation laws, aimed at preventing weapons of mass destruction and terrorism.

He ordered the items from a US-based science website and they were delivered to his parents’ home.

He pleaded guilty to two charges – sending nuclear material into Australia and possessing nuclear material.

At a sentence hearing in March, the lawyer described Lidden as a “science nerd” who committed the offences out of pure naivety.

“It was a manifestation of self-soothing retreating into collection, it could have been anything but in this case he latched onto the collection of the periodic table,” Sutton said at the time.

Lidden now works at a fast-food restaurant flipping burgers after being terminated from his role as a trainee at Sydney Trains.

He was fired after letting his bosses know about the Border Force investigation.

Sutton said the sacking came under the guise that Lidden had failed to be honest and transparent.

“How could he be more honest and transparent?” the solicitor asked.

Nuclear materials can be imported legally by contacting the Australian Nuclear Science and Technology Organisation for a permit first.