Reactors (2)

Question 1

Chain Reaction

Answer 1

When Nuclear Fission occurs energy (neutrons about 2-3) are released, this continues until most of the radiation is used up.

Question 2

Moderator

Answer 2

Used to slow the Chain Reaction from the release of 20,000km/s to 3km/s

Question 3

Thermal Neutrons

Answer 3

Slow moving particles created by the use of a Moderator during a Chain Reaction

Question 4

Pressurized Water Reactor (PWR)

Answer 4

• American made

- uses enriched uranium (2-4% U-235) and water as a Moderator

Question 5

Depleted

Answer 5

Element left over after Nuclear Fission with a Moderator. The left over element is less concentrated than what is found in nature.

• Depleted Uranium
• Used as “shielding” material in exposure devices

Question 6

Canadian Made Reactors (CANDU)

Answer 6

Use of a more expensive Moderator; Heavy Water D2O (deuterium and an Isotope of hydrogen with 1 p, 1 n, 1 e) which has a low absorption rate for neutrons.