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A nontraditional method of providing radiation protection instruction at a large health science center.

In the 4 quarter of 2001 the University of Alabama at Birmingham (UAB) converted its traditional classroom radiation safety course, taught exclusively in a classroom setting four times each year, to a combined online-classroom format in which the majority of the course is taught online. This change was instituted in an effort to minimize the time spent in the classroom for UAB research personnel. This format should provide the additional benefit of self-paced instruction for course participants. The hypothesis that the combined online/lecture format was as effective as the lecture-only format was tested. A statistical analysis was performed on the average first-attempt test scores of the tests (number of tests = 334) taken during a 2-y period before the online transition (average score = 75.5), and the average first-attempt test scores of the tests (number of tests = 359) taken during a 2-y period after the online transition (average score = 74.1.) A two-tailed Student's t-test was performed on the data. The t-value was 1.73, and P (T< or = t) was 0.083. At alpha = 0.05, the null hypothesis that the two averages are equal cannot be rejected. Thus the online course format appears to be as effective a method of radiation safety instruction as the more traditional, exclusively-classroom method of instruction. This article also reviews steps under consideration to improve the current online course to make it a more effective tool in radiation safety instruction.

Academic Medical Centers↗

[Computerized bone mineral measurement. Radiation protection and legal aspects].

We begin by defining the standard units utilized in dosimetry and we illustrate the risks related to the interaction of ionizing radiation with living matter. Next we summarize the basic elements of radioprotection such as the physical and medical control of the employees and the inspection by the official authorities. Finally we consider the specific aspects of radioprotection in bone mineral measurement, in relation both with dosimetry and with the existing legislation on the matter.

Absorptiometry, Photon↗

The basics of radiation protection for hospital workers: considerations and procedures.

Radiology is probably one of the most widely misunderstood technologies in healthcare. The health risks of x-ray exposure are not as great as many think, nor are x-rays the only source of radiation. The author dispels some of the mysteries with a definition of radiation, an explanation of its sources and standards, and some basic tips on protection.

Maximum Allowable Concentration↗

[Estimation of X-radiation protective coats in abdominal angiography].

Medical personnel involved in abdominal angiography are exposed not only to direct radiation but also scattered radiation from inspection tables, patients, image intensifiers, and the beam-limiting system (collimator), among others. Japanese standard JISZ4831 prescribes protective coats of at least 0.25 mm lead equivalent, which is the uniform thickness of lead equivalent. The most commonly used protective coats are 0.25 mm Pb, 0.35 mm Pb, or 0.5 mm Pb in thickness. The weight of a typical protective coat is about 3 kg. While some coats weigh up to 6 kg, wearing such heavy coats becomes physically burdensome as inspection time increases. The trade-off between physical burden and protection was considered by analyzing the X-ray intensity distribution and attenuation rate of scattered radiation in each position assumed by the medical staff. In the case of inspections performed at an x-ray tube voltage of 80 kV, it may be possible to reduce the weight of the lead rubber apron by about 33%. Namely, the lead thickness can be reduced uniformly by 0.20 mm Pb at 70 cm and 0.05 mm Pb at 100 cm, when the shielding capability of a 0.25 mm thick Pb layer is accepted as the standard at 40 cm above the gonad position. The same range of permeated X-ray dose for the gonad position may be reduced as well. In the case of 110 kV, when the lead thicknesses are 0.30 mm Pb at 40 cm and 70 cm, and 0.10 mm Pb at 100 cm, it is possible to reduce the weight of the lead rubber apron by about 28%.

Abdomen↗