Absorption and Radiation
Q1.
A radioactive source emits alpha (α), beta (β) and gamma (γ) radiation. The diagram shows what happens to the radiation as it passes between two charged metal plates.
 
(a)     Which line P, Q or R shows the path taken by:
(i)      alpha radiation              __________
(1)
(ii)     gamma radiation?         __________
(1)
(b)     The diagram shows three different boxes and three radioactive sources. Each source emits only one type of radiation and is stored in a different box. The box reduces the amount of radiation getting into the air.
 
Draw three lines to show which source should be stored in which box so that the minimum amount of radiation gets into the air.
(2)
(c)     The graphs show how the count rates from three different radioactive sources, J, K, and L, change with time.
 
(i)      Which source, J, K, or L, has the highest count rate after 24 hours?
_______
(1)
(ii)     For source L, what is the count rate after 5 hours?
_______________ counts per second
(1)
(iii)     Which source, J, K, or L, has the longest half-life? 
____________________
(1)
(iv)    A radioactive source has a half-life of 6 hours.
What might this source be used for?
Put a tick () in the box next to your choice.
 
To monitor the thickness of paper as it is made in a factory		
To inject into a person as a medical tracer		
To make a smoke alarm work		
(1)
(Total 8 marks)