MORE than 100,000 police officers are to be monitored for side-effects of using the controversial radio system Airwave, the government has announced.

The Home Office revealed details of the £5million health study yesterday, almost 18 months after Lancashire Constabulary asked for research to reassure officers.

Around 176 officers have complained of headaches, nausea and irregular sleep patterns since the force became the first in the country to use Airwave in the summer of 2001, according to the Lancashire Police Federation.

One officer, who claims the system damaged his hearing, is said to be considering legal action against his bosses.

But Lancashire Constabulary stresses no officer has been off sick due to the technology and that people with concerns were in a minority.

Nonetheless, the study will be the largest ever of its kind in the UK to ensure Airwave is safe to use. Imperial College, London is to carry out the research by monitoring 100,000 police officers for any impact on health.

The Home Office was unable break that figure down into how many officers from each of the eight forces using Airwave would be assessed. However, it did reveal that there will be two sections to the study.

The first will measure brain functions of 150 officers while using the system.

And the other will involve a 15-year programme looking into links to officers' long-term health.

Home Office minister Bob Ainsworth, said: "We are listening to officers on the ground and taking positive action.

"The health and safety of officers is our top priority.

"We have already undertaken research that shows that Airwave is safe to use.

"We are investing in this ground-breaking health monitoring programme to provide further reassurance to users about long-term safety.

"Airwave will deliver a modern, digital, more reliable and better quality national radio service, giving the police the communications technology they need to fight crime.

"Officers appreciate the operational benefits of Airwave and can be reassured that we will address pro-actively any concerns they may have."

Airwave's mobile phone-style radios replaced an analogue system and allow officers to access computer systems and talk to members of the public while out of the office.