Activation techniques have been used since their inception to analyse body fluids and tissues in medical research. In recent
years they have also been adapted to analyse tissues in vivo. Their wider application is restricted by their complexity and
relative inaccessibility, and inter-laboratory comparisons of analyses of reference materials continue to show serious discrepancies
for some elements. Activation techniques contribute most to medical science when they are applied to important medical problems
which cannot be solved in other ways and when they are used as reference techniques to evaluate simpler, more accessible methods.