Which type of radiation is positively charged?
Alpha (α)
Beta (β)
Gamma (γ)
What determines how radioactive a nucleus will be?
The proton:electron ratio
The proton:neutron ratio
The neutron:electron ratio
What would the penetrative limit of gamma (γ) radiation be?
A few centimetres of air
A sheet of aluminium foil
Thick concrete
Which type of radiation can be represented by the particle shown?
\[_{ - 1}^{\,\,\,0}{e^ - }\]
What type of particle does X represent in the equation shown?
\[\,_{\,91}^{234}Pa \to _{\,92}^{234}U + X\]
\[_{\,84}^{218}Po \to _{\,82}^{214}Pb + X\]
Which of the following would reduce the half-life of a radioisotope?
The mass of the radioisotope present
The temperature the radioisotope is stored at
Nothing affects the half-life of a radioisotope
Which radioisotope is used to date the age of once living materials?
carbon-12
carbon-13
carbon-14
After 24 days, the mass of a radioisotope was found to be one quarter its original mass. What is the half-life of the radioisotope?
4 days
6 days
12 days
A medical radioisotope has a half life of 1.5 hours. Its radioactivity was recorded as 10,000 counts min-1 at 9am. What will the count rate be by 3pm?
625 counts min-1
1250 counts min-1
2500 counts min-1