The Beta (Sr-90) irradiation unit was special designed to provide a homogeneous irradiation field and to allow RL (in particular radiofluorescence RF) measurements during Beta irradiation (dose rate about 0.1 Gy s-1).
Additional facilities include low level beta counting, high resolution gamma spectrometry, and the use of NAA, ICPMS and a range of calibrated alpha, beta and gamma sources.
Heating the mineral (or exposure to light) releases electrons, and produces a flash of light, setting the clock to 0 (maybe only partial).
Thereafter, luminescence accumulation is proportional to age.
Exposure to sunlight resets the luminescent signature and so the time period since the sediment was buried can be calculated.
The Luminescence Research Laboratory has an extensive range of equipment for luminescence dating and research, backed by a full suite of sample preparation laboratories, and an unmatched capability for measurement of the environmental radioactivity associated with dating samples.