Passengers passing through Australian airports will have no choice but to undergo a full body scan or cancel their travel plans under new laws the Federal Parliament hopes to introduce later this week.

With scanner installation expected in all international airports across the country from July this year, the Government has pushed for the approval of the proposed Aviation Security Amendment Bill 2012 that will remove the pat down option and make it mandatory for passengers selected to participate to undergo a full body scan, News.com reported.

Transport Minister Anthony Albanese said he was sure the public would be understanding and the measure was a necessity to ensure airport safety.

"I think the public understands that we live in a world where there are threats to our security and experience shows they want the peace of mind that comes with knowing government is doing all it can," Mr Albanese said.

However, many Australians have expressed concerns that full body scans are an invasion of privacy, stressing that the scanners would resemble the nude security screens put in place in the US last year.

Squashing outrage, the Government has stressed that the Australian body scanners have received approval from the Privacy Commission and images would appear as stick figures of neither sex.

Images taken will also be discarded immediately after the passenger has been cleared of any threatening objects.

Also eliminating any concerns of cancer exposing radiation emitting from the scanners, the Government has assured the public that the radio waves are the same as a regular mobile phone used meters away.

The $28 million security overhaul takes places after months of trails at Sydney and Melbourne airports in August and September last year.