The invention relates to the use of silicon-containing particles for protection of human cells from electromagnetic radiation in the UV range and optionally in the visible as far as the IR range, where the particles preferably take the form of clusters of primary particles having a particle size in the range from 5 to 100 nm. A particular advantage of the use according to the invention is the possibility of matching the absorption of the electromagnetic radiation to the wavelength region to be absorbed in a defined manner via the particle size. The silicon-containing particles can be used as biocompatible and biodegradable UV protection in cosmetic or medical formulations, such as preferably a sunscreen, or else in a cosmetic formulation for the UV protection of hair.本發明係關於含矽粒子於防護人類細胞免於UV範圍及隨意地可見光直到紅外光(IR)範圍之電磁輻射之用途，其中該粒子較佳採取一次粒子的集簇之形式，該一次粒子具有粒徑範圍為從5至100nm。根據本發明之用途的特別優點為，經由該粒徑以定義之方式將該電磁輻射之吸收與待吸收波長區域匹配之可能性。該含矽粒子係可在化妝品或醫療調和物如較佳地防曬品中，或者在頭髮之UV防護之化妝品調和物中，用於作為生物相容性且生物可降解性UV防護。
