An attempt has been made to clarify the two most important issues relevant to personal eye dosimetry. This involves the identification of the cells which are most at risk from radiation and the specification of their position in the eye. The depth of these cells has been evaluated in the human eye by means of geometrical construction. In a normal adult population (20-65 years) the minimum depth of the incriminated cells is 2.3+or-0.4. Approximate calculations for isotropic90Sr/90Y and106Rh beta -radiation fields indicate that a planar dosemeter, which integrates the tissue dose between depths of 2.5-3.5 mm, should give a reasonable measure of the mean equatorial dose for the variety of eye and irradiation geometries likely to be met during a life-time exposure.
展开▼
