[Systematic research on the dose distribution in mantle field irradiation with Co60 gamma radiation in the Alderson phantom].

A mantle field is localized according to the patient's data in an inhomogenous Alderson phantom. After having established the irradiation scheme, the dose distributions measured in the Alderson phantom are compared with those measured and calculated in an homogenous water phantom. The possible side effects of this irradiation technique can be assessed on the basis of the radiation exposure of heart, lung and spinal marrow. The dose differences found on the central ray are within the margin of error amounting to 5 to 10% which is indicated in the calculation program. In case of a total reference dose of 40 Gy, the radiation exposures of heart and lung do not reach the tolerance limit. A spinal marrow dose of 50 Gy is found in the upper neck marrow. In case of an exact therapy planning, a sufficient dose can be directed to the Waldeyer's tonsillar ring.