# Radioactive dating graphs

(b) At a distance of 30 mm from a point source of γ rays the corrected count rate is C.

Calculate the distance from the source at which the corrected count rate is 0.10 C, assuming that there is no absorption.

Name one type of radiation or particle that may be used in this investigation and describe the main physical principle of the scattering process.

State the information which can be obtained from the results of this scattering.

(b) For the reaction to take place the α particle must come within a distance, d, from the centre of the aluminium nucleus.

Calculate 'd' if the nuclear reaction occurs when the α particle is given an initial kinetic energy of at least 2.18 × 10 (ii) γ rays have a range of at least 1 km in air.

Write the two equations that represent these two possible modes of decay.

Graphic illustrations and on-location examples help students connect mathematics to daily life.

Show values of N and Z on the axes of your graph and draw the N = Z line.

(ii) On your graph mark points, one for each, to indicate the position of an unstable nuclide which would be likely to be an emitter, labelling it A, a emitter, labelling it B.

The diagram below shows a grid of neutron number against proton number.

A nucleus is marked in place: (a) Draw arrows on the grid, each starting on X and ending on a daughter nucleus after the following transitions: (i) Calculate the maximum possible kinetic energy, in J, which an emitted β– particle can have. Calculate each of the three possible γ-photon energies (iii) Calculate the frequency of the most energetic photon emitted.