A 24-year-old Australian man who ordered uranium and plutonium to his parents’ apartment has been allowed to walk away from court on a two-year good behaviour bond.

After ordering various radioactive samples over the internet in an effort to collect the entire periodic table, Emmanuel Lidden pleaded guilty to two charges: moving nuclear material into Australia and possessing nuclear material without a permit.

While his actions were criminal, the judge concluded that Lidden had mental health issues and displayed no malicious intent. He is the first person in Australia to be sentenced under the 1987 nuclear non-proliferation act for the importation and possession of nuclear material without the appropriate permits.

The delivery of the materials – which included a quantity of plutonium, depleted uranium, lutetium, thorium and radium – led to a major hazmat incident in August 2023. The entire street that Lidden lived on was closed off and homes were evacuated as Australian Border Force officials, firefighters, police and paramedics investigated.

Lidden is said to be relieved by the sentence. However, The Guardian reported that Lidden’s solicitor, John Sutton, had criticised the Border Force for how it had handled the incident, describing it as a ‘massive over-reaction’ because the quantities of material were so small they were safe to eat. He reportedly said that he had been contacted by scientists all around the world saying that the case was ‘ridiculous’.

Lidden is said to have made no attempt to hide his identity when ordering the items from a publicly accessible website in the US and then displayed the materials in plain view on a shelf in his bedroom.

In a statement, Australian Border Force superintendent, James Ryan, said he hoped the case would make more people aware of the regulatory frameworks around what can and cannot be imported into Australia.