Radiation

Question 1

What is a beta particle

Answer 1

An electron

Question 2

What is an alpha particle

Answer 2

2 protons and 2 neutrons

Question 3

What is a gamma ray

Answer 3

Waves with very high energy and short wavelength

Question 4

What is alpha absorbed by

Answer 4

Paper

Question 5

What is beta absorbed by

Answer 5

Aluminium

Question 6

What is gamma absorbed by

Answer 6

Sever cm of led or several m of concrete

Question 7

Count rate

Answer 7

Number of decays per second

Question 8

Define half life

Answer 8

The half life of an atom is the average time taken for the half the radioactive isotope in a sample to decay

Question 9

Activity

Answer 9

Number of unstable isotopes that decay per second

Question 10

What is radioactivity measured in?

Answer 10

Becquerels (bq)

Question 11

Most ionising to least

Answer 11

Alpha-beta-gamma

Question 12

Most penetrating to lease

Answer 12

Gamma-beta-alpha

Question 13

What is irradiation

Answer 13

When an object is exposed to radiation e.g X-rays

Question 14

What is contamination?

Answer 14

When an object is mixed or dispersed with another substance, e.g. poisoning of Litvineko

Question 15

1n + 235u —->236u ——>

0 92 92

Answer 15

141Ba+92Kr+3 1n (+energy]

56 36 0

Question 16

Nuclear fission

Answer 16

An uranium nucleus absorbs a neutron, splits into 2 smaller nuclei!, Kr and Ba nuclei and releases 3 neutrons and energy

Question 17

What is used to measure radiation

Answer 17

A Geiger counter

Question 18

Why is radiation harmful

Answer 18

Can ionise cells in our body

Question 19

What is nuclear fusion

Answer 19

The combination of two smaller nuclei into 1 large one releasing energy (e.g in stars)

Question 20

Where does fusion happen naturally?

Answer 20

Stars, start of universe and supernovas