The technique used to measure plant stability (in terms of dose delive
red) and the stability of calorimeter, PMMA and radiachromic film dosi
metry systems used at AEA Technology's Harwell EB plant is presented.
Standard deviations of less than or equal to 2.5% for plant stability
and 2% for dosimeter stability were recorded over the period of the la
st 18 months. Preliminary results are also presented from an assessmen
t of a new surface-read dosimetry system useful for dose-mapping at an
EB plant.