Radioactivity

Question 1

Beta particle(4)

Answer 1

• is a electron
• negative charge
• mass number:1/2000
• medium penetration strength

Question 2

Gamma ray

Answer 2

• is a photon
• zero charge
• mass number:0
• high penetration

Question 3

Atomic number

Answer 3

Number of protons in the nucleus of the atom

Question 4

Mass number

Answer 4

Number of protons + neutrons in he nucleus of the atom

Question 5

Isotopes

Answer 5

Two elements which have the same number of protons but different number of neutrons (atomic and mass)

Question 6

Ions

Answer 6

An atom that has gained or lost electrons

Question 7

Radioactive decay

Answer 7

Ransom emission of ionising radiation from an unstable nucleus

Question 8

Unstable nucleus

Answer 8

An nucleus with an inbalance of protons and neutrons. They can go to a lower energy state by emitting ionising radiation

Question 9

Activity

Answer 9

The number of decays that occur per second

Question 10

Bequerel

Answer 10

The standard unit for radioactivity

Question 11

Count rate

Answer 11

The number of signals a Geiger muller detector tube detects per unit time

Question 12

Background radiation(3)

Answer 12

Natural ratiation- rocks, cosmic rays and certain foods.

Question 13

Dose

Answer 13

Measurement of biological damage caused by radiation

Question 14

Half Life

Answer 14

The time taken for the radioactivity of a specific isotope to fall to half its original value

Question 15

Alpha Particle (4)

Answer 15

• Is a helium nucleus
• double positive charge(2+)
• mass number:4
• low penetration