RESUMO
Owing to the continuous turnover of registrars and radiographers, most of the trauma-related orthopaedic surgery in this academic hospital is done by inexperienced surgeons-in-training and the fluoroscopy by junior radiographers. This could result in excessive radiation doses. Calibrated lithium fluoride thermoluminescent chips were secured to various parts of the primary surgeon's body to quantify the radiation dose received during the insertion of an intramedullary nail. Closed intramedullary fixation of 15 fractures of the femur was done with interlocking as necessary. The total average exposure time was 14 minutes 45 seconds per procedure. Distal locking took up 31% of this time. The mean radiation dose to the surgeon's eyes and thyroid was 0.13 mGy and to the dominant hand 2.10 mGy. This would allow the performance of about 350 such procedures per year before the maximum permissible dose level was reached. Recommendations to decrease irradiation dosage are made.
Assuntos
Fraturas do Fêmur/cirurgia , Fixação Intramedular de Fraturas , Ortopedia , Doses de Radiação , Humanos , Ortopedia/educação , Proteção Radiológica , Dosimetria TermoluminescenteRESUMO
A tissue-equivalent anthropomorphic human phantom was used with a lithium fluoride thermoluminescent dosimetry system to evaluate the radiation absorbed dose to the ovarian and testicular region during dental radiologic procedures. Measurements were made with and without personal lead shielding devices consisting of thyroid collar and apron of 0.25 mm lead thickness equivalence. The radiation absorbed dose with or without lead shielding did not differ significantly from control dosimeters in vertex occlusal and periapical views (p greater than 0.05). Personal lead shielding devices did reduce gonadal dose in the case of accidental exposure (p less than 0.05). A leaded apron of 0.25 mm lead thickness equivalent was permeable to radiation in direct exposure testing.
Assuntos
Gônadas/efeitos da radiação , Proteção Radiológica/métodos , Dosimetria Termoluminescente , Humanos , Chumbo , Roupa de ProteçãoRESUMO
The relative biological effectiveness (RBE) of 100 kV X-rays compared with cobalt-60-gamma-irradiation was determined using a cell colony assay based on the survival of Chinese hamster V-79 lung fibroblasts. The 37% dose (Do) was found to range from 1.12 to 1.47 and from 1.33 to 1.63 Gy for X-rays and 60Co-gamma-irradiation respectively. The mean RBE value calculated from the Do values was found to be 1.13 +/- 0.04. This figure compares favourably with RBE values calculated from Do values using other endpoints.
Assuntos
Dosagem Radioterapêutica , Animais , Células Cultivadas/efeitos da radiação , Radioisótopos de Cobalto , Ensaio de Unidades Formadoras de Colônias , Cricetinae , Fibroblastos/efeitos da radiação , Raios XRESUMO
Two capacitor discharge X-ray units of different make were compared. The same radiological examinations were carried out with both units and the radiation exposure for every examination was measured on a Rando phantom with calibrated LiF-TLD Teflon discs. A large difference in radiation exposure for the same image quality was found between the two units. Factors such as the use of rare earth intensifying screens with capacitor discharge X-ray units, independent tube current settings and automatic charge replenishment are stressed.
Assuntos
Radiografia/instrumentação , Doses de Radiação , RadiometriaRESUMO
While high-energy photon radiation in radiotherapy of deeper tissues has a skin-sparing effect, contamination with electron and low-energy photon radiation can diminish and even abolish this effect. Experiments with perspex, aluminium and copper filters showed that a copper filter effectively diminished the skin dose owing to contaminated radiation.
Assuntos
Radioisótopos de Cobalto/uso terapêutico , Radioterapia/instrumentação , Elétrons , Partículas Elementares , Filtração/instrumentação , Dosagem Radioterapêutica , Pele/efeitos da radiaçãoRESUMO
A study of the rates of repeat radiography in two hospitals in the Cape Peninsula was undertaken. The relationship between these rates and the type of examination as well as the contributing factors was established. The total frequencies for the two hospitals varied from 10,1% to 14%. The predominant reasons for 78% of repeat radiographs were over-exposure, under-exposure and positioning.
Assuntos
Radiografia , Hospitais , Humanos , Tecnologia RadiológicaRESUMO
During fluoroscopic bladder and bronchial examinations the radiation workers concerned are exposed to 90 degrees--scattered photons. The effective energy expressed in mm AI was measured for these photons exited at tube potentials in the 60--100 kV RANGE. An increase also depends on whether the measurements are made in the direction of the long axis or the short axis of the phantom. These findings are contrary to the recommendations stipulated in the code of practice SABS 07-1972.