What is radiation GCSE definition?
What is radiation GCSE definition?
When an unstable nucleus decays it emits radiation, called radiation.
How is radiation used in medicine BBC Bitesize?
Doctors may use radioactive chemicals called tracers for medical imaging. Certain chemicals concentrate in different damaged or diseased parts of the body, and the radiation concentrates with it. it has a short half-life and so decays before it can do much damage.
What are the effects of radiation BBC Bitesize?
Radioactive materials are hazardous….The effects of radiation on the human body.
| Eyes | High doses can cause cataracts. |
|---|---|
| Lungs | Breathing in radioisotopes can damage DNA. |
| Stomach | Radioactive isotopes can sit in the stomach and irradiate for a long time. |
| Reproductive organs | High doses can cause sterility or mutations. |
| Skin | Radiation can burn skin or cause cancer. |
How does radiation work Bitesize?
Unlike conduction and convection – which need the vibration or movement of particles – infrared radiation is a type of electromagnetic radiation. When infrared radiation is absorbed by an object it is heated and its temperature rises. Because no particles are involved, radiation can work through the vacuum of space.
What is the most Ionising radiation?
Penetrating power
| Radiation | Range (cm) | Ionising power |
|---|---|---|
| Alpha | 3-5 | Highly ionising |
| Beta | about 15 | Ionising |
| Gamma | much longer | Weakly ionising |
Where is radiation used in medicine?
Nuclear medicine procedures help detect and treat diseases by using a small amount of radioactive material, called a radiopharmaceutical. Some radiopharmaceuticals are used with imaging equipment to detect diseases. Radiopharmaceuticals can also be placed inside the body near a cancerous tumor to shrink or destroy it.
What type of radiation is harmful?
Alpha particles are the most harmful internal hazard as compared with gamma rays and beta particles. Radioactive materials that emit alpha and beta particles are most harmful when swallowed, inhaled, absorbed, or injected. Gamma rays are the most harmful external hazard.
Which Colour is the best absorber of radiation?
Black
Black is a good absorber [ it reflects only 5% of the visible sunlight ] where as white is a good reflector [ it reflects almost 80% of the visible light ].
What are the five sources of radiation?
On this page
- Natural background radiation. Cosmic radiation. Terrestrial radiation. Inhalation. Ingestion.
- Artificial sources of radiation. Atmospheric testing. Medical sources. Industrial sources. Nuclear fuel cycle.
What is the activity of a radiation source?
The activity is the number of decays per second from an unstable nucleus. A source that emits one particle per second has an activity of one Bq. However, this particle could be alpha or beta and would, therefore, have a different effect on a person’s body.
How is background radiation used in everyday life?
The actual amount of radiation that a person is exposed to depends on where they live, what job they do and many other things. Scientists must always take into consideration the amount of background radiation when working or experimenting with radioactive sources and discount it from their results.
How are the effects of background radiation measured?
Background radiation affects everyone mainly by irradiation, but a small amount is from being contaminated by radioisotopes in the food and drink that is consumed. Measuring amounts of radiation The simplest measure of radioactivity is the Becquerel (Bq). This is a measure of the activity of the nucleus.
How are conduction, convection and radiation used in the human body?
GCSE Conduction, convection and radiation Energy can be transferred by conduction, convection and radiation. Insulation is used to stop heat energy transfers from buildings and the human body.