SEARCH · PubMed Health
Explore indexed PubMed citations for clinical trials, systematic reviews and public health research. Read source abstracts and follow each citation to its original PubMed record.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
Explore the source record for details and available documents.
Explore the source record for details and available documents.
Dried Bacillus pumilus spore strips had a stable D-value of 0.17 to 0.18 Mrad after 1 year at 5 or 25 C, but resistance was lost at 35 C. Refrigeration did not have an adverse effect on resistance to irradiation. The presence of water at the time of initial preparation increased this resistance to 0.23 to 0.25 Mrad. Proper drying is essential to achieve reproducible results in sterility tests using USP-type biological indicators.
Explore the source record for details and available documents.
Diagnostic radiation exposure in 133 consecutive newborns was studied using a TLD monitoring system. Eighty-eight per cent of dosimeters received less than 1 mSv (100 mrem) total exposure. The mean exposure per chest radiograph was 0.044 +/- 0.023 mSv (4.4 +/- 2.3 mrem). Abdominal surface exposure was 0.053 +/- 0.03 mSv (5.3 +/- 3.0 mrem) for boys and 0.044 +/- 0.021 mSv (4.4 +/- 2.1 mrem) for girls. The gonadal exposure, which was calculated from the abdominal exposure data, was 0.053 +/- 0.030 mSv (5.3 +/- 3.0 mrem) for boys and 0.026 +/- 0.012 mSv (2.6 +/- 1.2 mrem) for girls. The correction factor for beam attenuation over gonads in girls was 0.58. In general, the radiation received by these infants did not exceed the currently published protection limits.
Explore the source record for details and available documents.
The paper describes the radiation environment in the compartments of the orbital station Salyut-4 and in its flight orbit. It also discusses the measures taken to provide radiation safety of the crewmembers and the main results of radiation monitoring. During the flight the dose received by the crew was 1400 mrem.
Serial CEA radioimmunoassays have been performed on patients receiving radiation therapy preoperatively or as treatment of recurrent or metastatic colorectal cancer. Pretreatment circulating CEA titers which were elevated showed a significant decrease with accumulating doses of irradiation, indicating that the bulk of CEA-producing tumor was within the radiation therapy portal. The decrease of circulating CEA with preoperative radiation therapy was short-lived and suggested that surgical resection should be performed within 8 weeks of irradiation. Serial CEA titers are useful as an adjunct to other clinical, laboratory and radiologic data in formulating patient management decisions.
Explore the source record for details and available documents.
Serial CEA radioimmunoassays were performed on 16 patients receiving preoperative radiation therapy of rectal cancer or irradiation of recurrent or metastatic colorectal cancer. Radiation therapy of localized colorectal cancer reliably reduced previously elevated circulating CEA titers. Significant decrease of elevated CEA titers with accumulating doses of irradiation may indicate that the bulk of CEA-producing tumor is within the radiation treatment portal and assist in patient management decisions. The decrease of circulating CEA with preoperative radiation therapy was of short duration and may indicate that surgical resection should not be delayed more than 6-8 weeks after irradiation. Because of the high frequency of false positive and false negative results, CEA must be used only in conjunction with other clinical and laboratory parameters.
Explore the source record for details and available documents.
Explore the source record for details and available documents.
With the increased utilization of portable image intensifiers for pacemaker insertions, an investigation of the radiation hazards to operative personnel was undertaken. The personnel were tested first utilizing a Rando phantom and later during actual pacemaker insertions. Studies of medical personnel show the critical organs to be the thyroid (approximately 15mR per procedure) and the lens of the eye (approximately 13mR per procedure). While the MPD/week was not exceeded, the radiation dosage was substantial and could increase under operating conditions other than those measured. Recommendations to insure safer operation of this equipment are presented.
Explore the source record for details and available documents.
Explore the source record for details and available documents.
Explore the source record for details and available documents.
Explore the source record for details and available documents.
Radiation exposure of the population is expressed nowadays in terms of genetically significant dose and its individual components are compared. The calculations necessary for the present considerations have been carried out. As a basis for evaluating radiation protection, the natural sources of radiation and therir variations are used. The dose of 110 mrem/a for the population of the Federal Republic is subject os considerable variations. Artificially produced radiation contributes a total of 60 mrem/a to the exposure. Of this, most is contributed by medical sources with 50 mrem/a, second is exposure due to atom bomb research. Other sources of radiation, such as occupational exposure, its use in research and technology, and use of nuclear technology, contribute little to total exposure, each producing about 1 mrem/a. The data provided is supported by numerical evidence.