Tritium (Hydrogen-3) | 357050 TBq/Kg (9650 Ci/g) | 12.32 years | 5.7 (average) | Alpha emission only Isotope | Activity | Half-life | Energies (KeV) | Polonium-210 | 166500 TBq/Kg (4500 Ci/g) | 138 days | 5304.5 | Isotope | Activity | Half-life | Radiation types | Energies (KeV) | Caesium-137 | 3256 TBq/Kg (88 Ci/g) | 30.1 years | Gamma & beta | G: 32‚ 661.6 B: 511.6‚ 1173.2 |
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Seeing the Invisible A Lesson Giving Students an Opportunity to Discover Ultraviolet and Infrared Radiation Coming from the Sun By: Sallie M. Smith Howard B. Owens Science Center for the ISTP Mission istp.gsfc.nasa.gov/istp/outreach/solar_observation.pdf istp.gsfc.nasa.gov/istp/outreach/student_booklet.pdf 1 Seeing the Invisible - Table of Contents - 5 E’s Lesson Plan ........................................................................................................... 3 Teacher
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with a different phase. The waves from different directors interfere with each other and strengthening the antenna’s radiation in the desired direction‚ and cancelling out waves in the undesired directions. The ideal dipole antenna’s radiation pattern is as shown in Fig 1. Dipole Antenna Radiation Pattern below. The reflector and directors of Yagi Uda antenna cancels the radiation to the back and sides‚ and direct the wave to the forward direction. As the simulation result (Fig 2. 3D Polar Plot)
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patient awareness and physician’s practice of defensive medicine. These issues have led to an increase in patient radiation dose every year. From 1996 to 2010 overexposure due to radiation has doubled. (Bardi‚ p.2) This is an alarming stat and shows that we need to really focus on this issue in the future. Another alarming stat is that Americans received seven times more radiation exposure from medical tests in 2006 than in the 1980’s. (Biomedical Instrumentation & Technology‚ p.359) I believe
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nominally "free field" conditions. All sound energy will be traveling away from the source with almost none reflected back. Common anechoic chamber experiments include measuring the transfer function of a loudspeaker or the directivity of noise radiation from industrial machinery. In general‚ the interior of an anechoic chamber is very quiet‚ with typical noise levels in the 10–20 dBA range. According to Guinness World Records‚ 2005‚ Orfield Laboratory’s NIST certified Eckel Industries-designed anechoic
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electromagnetic waves) due to disintegration of atomic nuclei of some elements. These cause radioactive pollution. Radiations are of two types ionising and non-ionising. Non-ionising radiations affect only those components which absorb them and have low penetrability. Ionising radiations have high penetration power and cause breakage of macro molecules. Man-made sources of radiation pollution are mining and refining of plutonium and thorium‚ production and explosion and nuclear weapons‚ nuclear
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Interview with Academic Report – Professor Chris Sorrell Background Professor Chris Sorrell is an academic staff of the School Of Materials Science and Engineering at the University of New South Wales. Professor Sorrell specifies in Ceramics Engineering‚ which is a branch of materials science that researches substances that are made from metals that are non-metals and not organic. Professor Sorrell’s main research currently focuses on photocatalytic usage in various applications such as in the biomedical
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Vitamins vs. chemotherapy and radiation for cancer therapy We have a general understanding of cancer--one-third of cancer patients die in five years. (1) With present therapies‚ only slow annual improvement is expected. Vitamins have been extensively demonstrated in clinic trials. (2)‚ (3) Vitamins can strengthen the immune system to improve regular therapies and safely kill cancer. Here we compare cancer therapy by multivitamins with radiation and most chemotherapies. The big question is: Why are
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element‚ however‚ unlike elements‚ they feature a differing mass number‚ meaning the amount of protons and neutrons is imbalanced. (Gothard‚ 2004) Sometimes‚ an isotope exists with an unstable nucleus‚ spontaneously emitting excess energy through radiation known as alpha (α) particles‚ beta (β) particles or gamma (?) rays. (Figure 1) (Mandal‚ 2012)
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professionally and only when clinically pointed out to decrease fetal contact risk using the keeping acoustic output levels As Low As Reasonably Achievable (ALARA) principle. Ultrasonography consist of the use of sound waves and is not a form of ionizing radiation. There have been no news of recognized conflicting fetal effects for diagnostic ultrasonography measures‚ as well as duplex Doppler imaging. The U.S. Food and Drug Administration limits the spatial-peak temporal average intensity of ultrasound transducers
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