The Legend of a . F . Shields
نویسندگان
چکیده
The well-known doctoral work of Shields is a tale that is frequently recounted by many authors and has spawned a large, continuing body of research over the last 60 years. Despite the success of Shields’ work, the details of his experimental methods and results as reported by others are quite variable. Inconsistencies and misconceptions regarding Shields’ work are identified and examined here. Incomplete descriptions by Shields, loss of his original data, and Shields’ postgraduate absence from the hydraulic engineering community leave some of the identified inconsistencies open to debate.
منابع مشابه
A Novel Design for Production of Efficient Flexible Lead-Free Shields against X-ray Photons in Diagnostic Energy Range
Background: Lead-based radiation shields are widely used in radiology departments to protect both workers and patients from any unnecessary exposure to ionizing radiation. Recently there has been a great deal of concern expressed about the toxicity of lead. Human lead toxicity is well documented. In that light, production of environmentally-friendly lead-free radiation shields with less weight ...
متن کاملRadiation attenuation properties of shields containing micro and Nano WO3 in diagnostic X-ray energy range
Background: It has recently been shown that the particle size of materials used for radiation shielding can affect the magnitude of radiation attenuation. Over the past years, application of nano-structured materials in radiation shielding has attracted attention world-wide. The purpose of this study was to investigate the shielding properties of the lead-free shields containing micro and nano-...
متن کاملComparing X-ray dose reduction capability of silicon-bismuth micro- and nanocomposite shields using chest CT test
Comparison of radiation shields of different thicknesses and structures (especially different particle sizes of their constituents) is helpful to select an appropriate shield for patient protection in medical imaging tests particularly CT-scan. In this study micro- and nano-powders of bismuth were mixed with silicone matrix to make composite radiation shields for breast. The shields were provid...
متن کاملبررسی تاثیر عوامل ساختاری بر اثربخشی حفاظتی سپرهای الکترومغناطیس دولایه
Introduction: Nowadays, demand for protection against radar radiation using electromagnetic shielding is on the rise. Double-layer or multilayer shielding were devised in order to improve the single layer electromagnetic shielding properties. In this study, we tried to prepare a new double-layers electromagnetic shield and investigate the effect of structural factors such as thickness, similar...
متن کاملApplication of personal non-lead nano-composite shields for radiation protection in diagnostic radiology: a systematic review and meta-analysis
composites with micro- and nano-metal fillers has attracted the attention of researchers for radiation shielding applications. Lead toxicity and heaviness have oriented extensive research toward the use of non-lead composite shields. The present study aimed to systematically review the efficiency of the composite shields of various micro- and nano-sized materials as composite shields have been ...
متن کامل