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|Ermittlung der Strahlenexposition des veterinärmedizinischen Personals bei routinemäßigen Röntgenuntersuchungen in der Pferdepraxis mit Hilfe elektronischer Personendosimeter|
Steinberg, Meral Kristina
|Main title||Ermittlung der Strahlenexposition des veterinärmedizinischen Personals bei routinemäßigen Röntgenuntersuchungen in der Pferdepraxis mit Hilfe elektronischer Personendosimeter|
|Title variations||Measurement of the exposure to ionizing radiation of veterinary staff during routine x-ray examinations in equine practice by use of electronic personal dosimeters|
|Author(s)||Steinberg, Meral Kristina
Place of birth: Oberhausen
|1. Referee||Univ.- Prof. Dr. K. Hartung|
|Further Referee(s)||Univ.- Prof. Dr. A. Grabner
Univ.- Prof. Dr. L. Brunnberg
|Keywords||horses, diagnostic techniques, radiography, x-radiation, radiation, exposure, personnel, dosimetry (MeSH)|
|Classification (DDC)||630 Agriculture, Veterinary medicine|
|Summary||Shortly after the discovery of x-rays by Wilhelm Conrad Röntgen in 1895 first reports of detrimental side effects, i.e. death, on living organisms were reported. Ever since the reduction of the exposure to ionizing radiation has been a topic of discussion in human as well as in veterinary medicine. It is still an up to date topic.
The aim of the research is to clarify the exposure to ionizing radiation in veterinary staff during routine x-ray examinations of horses at the “Klinik für Pferde, Allgemeine Chirurgie und Radiologie der Freien Universität Berlin” and at other equine practices. The radiation exposure was measured by using electronic personal dosimeters (EPD). The goal was to create a representative job-exposure-matrix for equine practitioners for each type of x-ray examination, as well as a guideline for working with x-rays.
Electronic personal dosimeters were used in 2429 x-ray examinations to determinate the exposure of the staff in 27554 single dosage readings. Dosage readings were taken on all persons who were exposed to radiation (“x-ray shooter”, “cassette holder”, “groom”) at the “Klinik für Pferde der FU Berlin” and at three other equine hospitals. The personal-equivalent-dose [μSv] was measured in 10 mm (Hp(10)) tissue depth. Dosimeters were attached over the thyroid gland, gonads (before the lead apron), gonads (behind the lead apron) and the feet. The personal-equivalent-dose [μSv] in a tissue depth of 0,07 mm (Hp(0,07)) was measured on the hands of the cassette holder or on mechanical cassette holders and on the lead gloves.
Results show that the exposure to radiation at the torso of staff of the “Klinik für Pferde der FU Berlin” as well as the other clinics while x-raying the equine distal limb is low (median lies below 2 μSv). Highest doses are expected at the feet of all exposed persons. An exposure of 86 μSv was detected at the feet of the “cassette holder” during x-ray examinations of the equine distal limb.
Higher dosage-counts on all persons are expected while x-raying larger volumina such as shoulder, neck, back, thorax and pelvis. The doses varied with the geometric arrangement of the persons to the primary x-ray field and the source of scatter radiation. Dosimeters placed by the thyroid gland and the gonads on the “groom” and the “x-ray shooter” showed that the persons nearest to the different radiation sources had the highest exposure to radiation during examination.
While taking radiographs of larger volumina, the scatter radiation is partially absorbed by surrounding tissue so that the “cassette holder”, who mostly stands caudally of the x-rayed region, is lower than assumed. The hands of the “cassette holder” are close to the primary x-ray field during x-ray examinations of the equine distal limb, head, and torso, so that the highest dosage readings should be expected here.
Exceeding the annual dosage-borderlines through persons professionally exposed to radiation (category A (RöV 2003)) is unlikely. For low-dose measurement results the careful handling of ionizing radiation according to the “Strahlenschutz in der Tierheilkunde” guidelines (2005) is required.
This study is able to show that veterinary staff is exposed to radiation during x-ray examinations. This exposure, even if very low, can lead to stochastic health effects of radiation in the human body. Rising dosages make stochastic health effects of radiation more likely. Applying the standards of precaution while dealing with radiation according to the RöV (2005) and the “Strahlenschutz in der Tierheilkunde” guideline (2005) no negative effects on health should occur in veterinary practice.
The evaluation of using EPD´s to measure radiation exposure in equine practice is positive. EPD´s can be worn at the torso without hindering movement. Dose readings can be viewed immediately and linked to a certain x-ray examination. Daily, weekly and monthly dosage readings are possible. The results are in an electronic, non-changeable form. Results are comparable to those of TLD´s.
Dataobject from FUDISS_thesis_000000004476
|Number of pages||VIII, 188 S.|
|FU Department||Department of Veterinary Medicine|
|Year of publication||2008|
|Document type||Doctoral thesis|
|Authors comments||Mensch und Buch Verlag|
|Date of defense||2008-04-15|
|Created at||2008-07-22 : 08:07:12|
|Last changed||2010-02-19 : 11:18:36|