Some types of ionising radiation can be used to diagnose or treat some medical conditions.

What does ionising radiation mean?

Radioactive emissions arise from u__________ atomic nuclei because of an imbalance between the numbers of protons and n_____________. These are called r__________________ isotopes. To try and become s_______, radioactive isotopes s_______ up in a process called ________________ decay and emit radioactive radiation.

A beta particle is a high velocity _________ which comes out of the ______________ of an atom.

___________ radiation is the most penetrating and is not even completely stopped by several meters of ______ or concrete and will pass straight through the human ______.

X-rays are able to pass through the human ______. As they pass through, the energy from
X-rays is _______________ at different rates by different parts of the body.
A _____________ on the other side of the body picks up the X-rays after they’ve passed through and turns
them into an __________.

Are X-rays and CAT scans safe?

Unlike __-_____, ultrasound waves are not ionising. This means they are _______ to use when performing
a foetal scan.

The injected __________ carries the radioisotope to the part of your _____ under investigation. The
radioisotope gives off ___________ rays, which are detected by a gamma camera.
The information is passed to a computer which produces an ________.
A gamma camera scan will show how well an _________ or part of your body is working.

Radiotherapy is a treatment involving the use of __________ radiation. It is commonly used to treat ____________.

____________ radiotherapy involves using a __________ which focuses __-_____ at the ___________.

Drugs are substances that change chemical _____________ in the body.
Medical drugs relieve ___________ and illness, and are extensively ___________ before being used.

Clinical testing can made more reliable by stopping the observer making biased observations.
This is done by using:

A blind trials
B double-blind trials
C animal testing