In 5 half-lifes what fraction of a sample remains?
1/128 of a sample remains. How many half-lifes has passed?
The half-life of carbon-14 is 5800 years. How long is 3 half-lifes for carbon-14?
Which is the symbol of the alpha particle or helium nucleus?
Which is the symbol of the positron?
Have the same number of neutrons as the element.
Have the same number of protons as the element.
Have the same mass as the element.
The half-life of a sample is 10 000 years. How many half-lifes have passed in 300 000 years?
Half-life = 10 mins. t = 20 mins. No = 100g.
Which of the four fundamental forces is the strongest?
Strong nuclear force - among neutrons
Electromagnetic - charge/magnetic
Weak - within nucleus
Which of the four fundamental forces is the weakest?
Concerning nuclear binding energy in an atom, the mass of the whole is greater than the mass its components.
In a nuclear power plant, the moderator...
Is located in the reactor core.
Is a fluid that slows down fast moving neutrons.
Absorbs neutrons to prevent uncontrolled reactions.
Is thick concrete.
The control rods in a nuclear power plant...
Prevents uncontrolled reactions.
Speeds up neutrons.
The weighting factor (Wr) is the...
Relative biological effect of radiation.
Energy per mass absorbed in a body.
The Equivalent Dose is...
The combination of absorbed dose and relative effect in biological systems.
Energy received from a radiation source. (J)
The unit of absorbed dose is...
The unit of eqivalent dose is...
The formula of absorbed dose is...
E / m
D x Wr
Is electromagnetic radiation with low energy.
Does not change the electronic configuration around nuclei.
High energy radiation.
Have a +2 charge
Have a mass of 4 u
Have 2 electrons.
Have a +1 charge.
Have a mass of 1.
Ionising power is...
The ability to ionise materials.
The ability of ionising radiation to move into or through materials.
Which particle has the most ionising power?
Which particle has the most penetrating power?
What is the yellow bar in the image?
What is the white bar in the image?
Rn-222 alpha decays into...
Alpha particles can be stopped by...
Skin or paper
What are the two factors are taken into account when determining the effective half-life of a radiopharmaceutical?
Readily available and cheap to produce.
Produce high-quality images for low doses.
Have a local source of production.
Identify four biological mechanism by which diagnostic radionuclides are used.
The type of energy emitted and their range in tissue.
The metabolic pathway to the tissue.
Should be concentrated at a particular locations where it can be most effective,
Stays in the location for a sufficient time to achieve what is intended and leaves in a reasonable time.
Which particle is least likely to cause the damage?
Nuclides with a mass number of less than 56 favour...
Nuclides with a mass number of more than 56 favour...
The highest point on this graph is...
the point of greatest stability.
Energy released by Fe-56
What is penetrating power?
Beta particles can be stopped by...
Gamma rays can be stopped by...
Which particle has the shortest range in air?
Positron particles are deflected in the opposite direction to alpha and beta particles in an electric field.
The force of the alpha particle is half as large as a beta a positron particle.
The higher the binding energy per nucleon...
The more stable the nuclide.
The less stable the nuclide.
The coming together of two nuclides to form a new nucleus with a greater atomic number.
The coming together of two nuclides to form a new nucleus with a smaller atomic number.
The neutrons released from the fission of Uranium-235 are...