This paper quantifies the extent of the radiation hazard to personnel
from horses undergoing scintigraphy using technetium(99m) methylene di
phosphonate (Tc-99(m)-MDP). From the data produced it is possible to d
erive safe working protocols which are comfortably within the legislat
ed limits for whole body doses as set out in the Ionising Radiations R
egulations 1985. Measurements were made of the surface and environment
al activities which result from individuals undergoing scintigraphic e
valuation and also from urine contaminated bedding. The use of both hi
gh and low activities in the assessment of the radiation hazard to per
sonnel and owners is considered.