Biomedical subjects

K Welker

Publications and source records attributed to K Welker.

30 records · Page 2Linked to original sources

PubMed1975

[Neutron therapy in the G.D.R. Fundamentals of fast neutron application in radiation treatment (author's transl)].

In 1972 GDR started with the treatment of tumor patients with fast neutrons on the base of oxygen-effect. That means a better sensitivity of radiation of anoxic cells against radiation with high LET in comparison to radiation of thin ionization. Every tumor contains some anoxic cells. Therefore a better effect is possible with doses that are tolerated by normal tissue. In the following the details of the problems are discussed.

Anaerobiosis↗

PubMed1975

[Neutron therapy in the G.D.R. II. Dose distribution near the surface (author's transl)].

The knowledge of the dose near the skin is very important for the reaction of the skin. With a special ionization chamber measurements near the surface of the phantom were made. A slight build-up-effect was observed. In this case (average energy of 6,2 MeV) the maximum of dose is in the depth of 1,2 mm.

Fast Neutrons↗

PubMed1975

[Neutron therapy in the G.D.R.III. Estimation of dose distribution in phantome (author's transl)].

This report describes measurements in a tissue equivalent phantom. At first the depth-dose curve is determined. Then the distribution of dose orthogonal to the central beam is determinated. On the base of these results single field distributions are constructed and also distributions in case of irradiations from both sides. Any influence of different ti-sues (fat, bone) to the distribution of isodose could not be pointed out. Distributions of isodose from Co60-moving fields added to the distributions of neutrons are described.

Carbohydrates↗

PubMed1972