By Khalil Arshak, Olga Korostynska
The specter of nuclear "dirty" bombs, a transforming into shift to nuclear strength, and new scientific remedies utilizing radiation are only many of the present advancements bringing new significance to dosimetry the detection and size of radiation. This complete quantity is essential to engineers and scientists operating in dosimetry to guard the future health and security of radiation employees and most people. starting from easy concept to strengthen innovations, this whole reference covers the physics of radiation, the organic results of radiation, and the know-how of radiation sensing and size. It presents an invaluable consultant to commercially on hand dosimetry gear and explains their purposes. Surveying present and state-of-the-art tools and fabrics used to become aware of radiation and list dosages, the ebook additionally explores novel techniques for designing new inexpensive radiation sensors and furthering dosimetry study.
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Extra resources for Advanced Materials and Techniques for Radiation Dosimetry
For a point source, the flux at a distance r is inversely proportional to the square of the distance r. For a point source, the radiation dose rate is directly related to the flux, therefore the dose rate also obeys the inverse square law. It can be noted that doubling the distance from the source reduces the dose rate to one-quarter of its original value, triplication of the distance reduces the dose rate to one-eighth, and so on. The third method of controlling the external radiation hazard is by means of shielding.
In external therapy, the aim is to deliver as high a dose as possible to the tumor while limiting the dose to the surrounding normal tissue. High doses in the order of tens of Gy are needed to kill malignant cells. Whole body doses of these magnitudes would be fatal. The body can, however, tolerate high doses to local tissue volumes. With internal nuclear medicine, a radioactive source is administered to the patient. It could be in form of a drug or carrier material labeled with a radioactive material.
Weighting factors wT for several organs and tissues T have been fixed for characterizing the radiation exposure of man in ICRP publication 60 . These weighting factors result from the proportionate radiation risk RT for the particular organ. 4. 01 Remainder 40 Total Source: . 00 30 Advanced Materials and Techniques for Radiation Dosimetry The weighting factors represent mean values for all age groups and both sexes. A measure of radiation exposure has therefore been defined with the effective dose equivalent, which does not serve to strictly determine the actual radiation exposure of an individual but represents the mean radiation exposure of a member of a mixed population.