Abstract: In a gamma camera at least a part of an outer shell of lead and preferably also of the inner casing of steel surrounding a scintillation crystal is cut away on one side and is replaced with a flat but thinner plate of a material having better radiation absorbing characteristics, such as tungsten. In this way, the distance from the outside edge to the useful central measuring area is reduced on that side such that the camera can be rotated in the smallest possible circle around the head of a patient to perform a more complete and precise measurement on the majority of the head.

Abstract: Platinum diamine complexes of the general formulae ##STR1## wherein R.sub.1 and R.sub.2 independently from each other are a hydrogen atom or a substituted or unsubstituted alkyl, cyclo-alkyl, aryl or aralkyl group, while R.sub.1 and R.sub.2 may be together a substituted or unsubstituted cyclo-alkyl group, R.sub.3 and R.sub.4 independently of each other are a hydrogen atom or a substituted or unsubstituted alkyl, aryl or aralkyl group and X is a chlorine, bromine or iodine atom, a sulphate radical, a substituted or unsubstituted carboxylate rest like an acetate or substituted acetate radical, an oxalate, malonate, hydroxymalonate or otherwise substituted malonate group or a carboxylate group, the group Y, independently from X is a chlorine, bromine or iodine atom, a hydroxyl group, a nitrate group of a carboxylate group have been found to exhibit antitumor activity together with little or none kidney toxicity and are thus of interest as a medicament.

Abstract: This invention relates to novel platinum-diamine complexes having the formula: ##STR1## wherein R.sub.1 and R.sub.2 independently of each other may be selected from the group consisting of hydrogen, an alkyl group having 1-20 carbon atoms, a cycloalkyl group having from 3-7 carbon atoms in the ring, an aralkyl group, and an aryl group having 1-20 carbon atoms, whereas R.sub.1 and R.sub.2 together may form a cycloalkyl group having 3-7 carbon atoms in the ring and having the formula: ##STR2## wherein N is 2 to 7 and wherein R.sub.3 and R.sub.4 independently of each other are selected from the group consisting of hydrogen, an alkyl group having 1-20 carbon atoms, an aryl group or an aralkyl group having 1-20 carbon atoms in the alkyl group and X is an anionic group, providing that when X is either chlorine or malonate, R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are not each H; when X is chlorine and R.sub.1 and R.sub.2 are each H, R.sub.3 and R.sub.4 are not each methyl; when X is chlorine and R.sub.1 and R.sub.