How does radiation travel? Gamma rays travel like any other electromagnetic waves - cutting a fairly straight line through world. They can move through a vacuum, or through air or water. They can also cut through light elements like aluminum or most metals. Lead can cut down on gamma radiation, but it can't really stop it. One inch of lead will cut any amount of gamma radiation by half. Another inch will cut it by another half, and so on, and so on.
1 The most points are available at Tesco alliance stations (1 point for every Â£3 spent). 2  Elsewhere it's 1 point for every 2 litres of fuel. 3  Shell: The Shell Drivers Club and V-power Clubs offers shopping vouchers, Avios and other rewards. Elsewhere it's 1 point for every 2 litres of fuel. 2  Shell: The Shell Drivers Club and V-power Clubs offers shopping vouchers, Avios and other rewards. 3  V-power offers double points when cardholders buy the fuel of the same name but, as with BP, that's more expensive.
What's the price difference between standard and premium fuels? According to the petrolprices.com, the average price of a litre of unleaded petrol is currently 103.49p per litre, with super unleaded costing over 11p more at 114.05p per litre. Diesel drivers can expect to pay Â£104.01 per litre of standard fuel, and Â£116.94 per litre of premium. And petrol users should be aware that standard unleaded is often marketed as âpremiumâ, which could lead to some confusion. As a rule of thumb, it's generally 'super' for petrol and 'premium' for diesel.