Tetra will replace existing radio systems by 2005

They are campaigning against a new �2.5 bn system, known as Tetra - Terrestrial Trunked Radio - which is currently being introduced throughout the UK to improve police communications.

Although hailed as cutting-edge technology, some experts have raised health concerns about the new transmitters the radio system requires.

Tetra masts pulse at 17.6Hz which is very close to the 16Hz frequency the government's Independent Expert Group on Mobile Phones warns might affect brain activity.

Some studies have suggested that radio waves around this frequency could cause calcium to leak from the brain, triggering damage to the nervous and immune systems.

The long-term impact of living close to a Tetra mast is just not known, and we are not prepared to take the risks for ourselves or our children Diana Frew

Fife resident Diana Frew is one of the campaigners asking the parliament to intervene over the introduction of Tetra masts to the area.

She said: "The safety guidelines which exist for mobile phones do not apply to Tetra.

"Scientists and tests have confirmed that Tetra masts pulse at 17.6Hz, a frequency known to produce adverse health effects.

"The long-term impact of living close to a Tetra mast is just not known, and we are not prepared to take the risks for ourselves or our children."

Green MSP Mark Ruskell, who represents Mid-Scotland and Fife, has tabled a motion calling for the introduction of the masts to be suspended.

'Proper standards'

He said: "We all want an effective system of communication for the emergency services, but if that system has risks for police personnel and the public then it's an absolute non-starter.

"With such widespread public and scientific concern, we should not be even contemplating the introduction of the Tetra system into Scotland until all the evidence has been scrutinised by the parliament and proper standards developed."

Alison Mackay, who lives 200m from a proposed mast site on Tarvit Hill near Cupar, added: "These masts are not safe, and the Scottish Executive needs to test them against adequate safety standards before they are unleashed on the public."