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.
Tesco are decent; better than Nectar IMO. I think they reduced the points on fuel recently to 1 point for every Â£2 spend, but it is still not bad. Each point is worth 1p in cash vouchers, so not a great return if you spend them that way, but they are worth much more when spent elsewhere.For example, I use them to collect Airmiles.news]. Use a cashback credit card (reward 1) and then get the points from using your loyalty card (reward 2). Assuming a 1% cashback, and 1 point (or 1p) per pound spent, you get Â£1 back (one way another) every time you put in Â£50.