Radiation Hazard Evaluation and Control in Hospitals

Radiology ◽  
1955 ◽  
Vol 65 (6) ◽  
pp. 892-902 ◽  
Author(s):  
G. Ferlazzo ◽  
T. Nicholson ◽  
A. Jacobson ◽  
M. Bushman
Keyword(s):  
Radiation Hazard ◽  
Hazard Evaluation ◽  
And Control

Organization and Conduct of Surveillance of Radiation Safety of the Population in Preparation and Holding of 2018 FIFA World Cup in Saint Petersburg

2020 ◽  
pp. 67-70
Author(s):  
N.S. Bashketova ◽  
G.A. Gorskii ◽  
R.K. Fridman ◽  
A.V. Eremin
Keyword(s):  
Building Materials ◽  
Radiation Safety ◽  
Integrated Approach ◽  
Radiation Monitoring ◽  
Radiation Hazard ◽  
Sports Facilities ◽  
Sporting Events ◽  
World Cup ◽  
Fifa World Cup ◽  
And Control

The purpose of the study was a hygienic assessment and generalization of practical experience of the St. Petersburg Rospotrebnadzor Office and the Center for Hygiene and Epidemiology in St. Petersburg acquired within the framework of the established powers in supervision and control of radiation safety of the population and combating radiation terrorism when preparing and holding mass events of 2018 FIFA World Cup in St. Petersburg. Materials and methods. We used the materials on planning and implementing measures to ensure radiation safety of the population and reports of the St. Petersburg Rospotrebnadzor Office and the Center for Hygiene and Epidemiology in St. Petersburg for 2016–2018. Results. We made a hygienic assessment of comprehensive measures for supervision and control over ensuring radiation safety of the population in preparation for mass sporting events, summarized the practice and efficient results of organizing and conducting monitoring of the radiation situation, radiation monitoring at infrastructure facilities, including radiological studies during the construction and reconstruction of sports facilities, and radiation control of baggage X-ray inspection systems used at the sites of sporting events for additional security measures. A scheme of organizing radiation monitoring of building materials and products delivered to sports facilities under construction was developed to eliminate excessive costly spectrometric studies while guaranteeing effectiveness of radiation monitoring. We demonstrated that an important step in the integrated approach to ensuring radiation safety was the control over introduction of additional safety measures immediately at the facilities operating on radioactive substances and posing radiation hazard in St. Petersburg, taking into account the category of their potential radiation hazard, as well as the preparedness of specialized Rospotrebnadzor units to promptly respond to emergency situations. Activities of the Regional Interdepartmental Operational Headquarters for Security showed absolute efficiency of interdepartmental cooperation between federal and municipal executive authorities.

Control of Metal Alloy Oxidation with Electric Fields

1973 ◽  
Vol 31 ◽  
pp. 164-165
Author(s):  
R. R. Dils ◽  
P. S. Follansbee
Keyword(s):  
Electric Fields ◽  
Oxidation Process ◽  
Base Alloy ◽  
Oxide Surface ◽  
Platinum Electrodes ◽  
Insulating Layer ◽  
Iron Base Alloy ◽  
Alloy Oxidation ◽  
Aluminum Oxide Layer ◽  
And Control

Electric fields have been applied across oxides growing on a high temperature alloy and control of the oxidation of the material has been demonstrated. At present, three-fold increases in the oxidation rate have been measured in accelerating fields and the oxidation process has been completely stopped in a retarding field.The experiments have been conducted with an iron-base alloy, Pe 25Cr 5A1 0.1Y, although, in principle, any alloy capable of forming an adherent aluminum oxide layer during oxidation can be used. A specimen is polished and oxidized to produce a thin, uniform insulating layer on one surface. Three platinum electrodes are sputtered on the oxide surface and the specimen is reoxidized.

Evidence for a Blood Ganglion Barrier in the Superior Cervical Ganglion of the Rat

1982 ◽  
Vol 40 ◽  
pp. 204-204
Author(s):  
D. M. DePace
Keyword(s):  
Blood Vessels ◽  
Superior Cervical Ganglion ◽  
Peripheral Nerves ◽  
Time Schedule ◽  
Transmission Electron ◽  
Cervical Ganglion ◽  
The Central Nervous System ◽  
Cervical Ganglia ◽  
Capillary Circulation ◽  
And Control

The majority of blood vessels in the superior cervical ganglion possess a continuous endothelium with tight junctions. These same features have been associated with the blood brain barrier of the central nervous system and peripheral nerves. These vessels may perform a barrier function between the capillary circulation and the superior cervical ganglion. The permeability of the blood vessels in the superior cervical ganglion of the rat was tested by intravenous injection of horseradish peroxidase (HRP). Three experimental groups of four animals each were given intravenous HRP (Sigma Type II) in a dosage of.08 to.15 mg/gm body weight in.5 ml of.85% saline. The animals were sacrificed at five, ten or 15 minutes following administration of the tracer. Superior cervical ganglia were quickly removed and fixed by immersion in 2.5% glutaraldehyde in Sorenson's.1M phosphate buffer, pH 7.4. Three control animals received,5ml of saline without HRP. These were sacrificed on the same time schedule. Tissues from experimental and control animals were reacted for peroxidase activity and then processed for routine transmission electron microscopy.

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