This bachelor thesis deals with the use of rectum spacers for teletherapeutic irradiation of the prostate. Risk factors for radiation toxicity include higher dose and bigger volumes within specific isodoses, history of abdominal surgery, advanced age, diabetes mellitus, hemorrhoids, and inflammatory bowel disease. A spacer between the prostate and the rectum can be used to move the anterior rectal wall out of the high dose radiation area. Requirements for a spacer are a well-tolerated insertion, a stable position up to two months of radiation therapy and biodegradation. A spacer should not be allergenic or toxic. The focus of the work lies in the description of the further quality of life related to the function of the intestine, the urinary tract and the sexual function and also the late toxicity after the irradiation. It describes the benefits of the rectal spacer and compares the quality of life with irradiations without a rectum spacer.