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- what happens if the temp drops back to Tc? What do you need to do to the instruments then?What is the maximum energy, maximum frequency and minimum wavelength associated with an 6MV beam?For the intensity of a monochromatic beam of gamma rays to be reduced to 30% of its initial value, what thickness of a material is needed if it is measured in terms of the half-value layer for that material?
- Investigate and explain the "Gyromagnetic ratio", from this calculate the value of the gyromagnetic constant γn /(2π) for the nucleus of Hydrogen 1H and sodium 23Na into MHz/TBadiation Homeworl s A star of radius 6.95 x 10° meters has tempera ture of 10,000 K. Assuming its perfect cadietor, a) Caleulate the power radiated by the Star, b) How mueh is cadiated in energy one day ? zS A selid sphere ot redivs 30 em is heated to soo'C befoce beine pleced inside of a refrigerator ukose tempesature is 5'e. If the sphere the can radiete at 25% what is power cadiated while iaside the ret sngeietor?You are asked to design a spectral filter that practically removes 99.0% of the low energy photons in an X-ray beam. Such photons contribute to the patient dose without contributing to the image and are defined as no more than 1% of these photons making it to the other side of the patient. Assume a patient can be modelled as a 20cm thick homogenous object with linear attenuation coefficients as shown below in Table 1. What is the thickness of the filter needed to eliminate all the energies which satisfy the above requirement? Filter linear attenuation properties are given below in Table 2. Table 1: Linear attenuation coefficients vs. energy of patient equivalent material Energy [keV] Habject (mm| 20 0.02601 30 0.02407 40 0.02303 50 60 0.02151 0.02013 Table 2: Linear attenuation coefficients vs. energy of filter material 60 0.06684 20 Energy (keV] Hrter (mm 30 40 50 70 0.1225 0.1067 0.0872 0.07541 0.06327
- The linear absorption coefficient of 1 MeV X-rays in water is 7.06 m-1. How many times will the radiation intensity decrease in a 19.6 cm thick water layer?Typical 10-fold intensity reduction values for X-ray radiation with energy 1 MeV are 30 cm for bone tissue, 100 cm for muscle tissue. Find mass and linear attenuation coefficients if densities are 1.85 g/cm3, 0.994g/cm3, respectively.According to the article Alien Antimatter Crashes into Earth 2 : More than 60 years ago, future Nobel laureate Sheldon Glashow predicted that if an collided with an antineutrino the antimatter answer to the nearly massless neutrino electron, it could produce a cascade of other particles. The "Glashow resonance - phenomenon is hard to detect, in large part because the antineutrino needs about 1,000 %3D times more energy than what's produced in the most powerful colliders on Earth. Let's compare this event to an ordinary baseball with a mass of 146 g. Please use three significant figures in your calculations.
- A certain technique calls for 50 mA and 0.1 s at 65 kV. If we have an uncooperative patient and wish to reduce motion by using an exposure time of 1/60 s, what will the new mA value be? What is meant by the penetrating ability of an x-ray beam? How can the penetrating ability of a beam be changed?A neuto is moving at a speed of 71 m/s a.) The debregoli wavelength associated with the neutron is _________ nm. b.) If another neutron B travels at four times the speed of neutron A, the ratio of the wavelengths of neutron B to neutron A will be ______. c.) If the uncrtainty of measuring the speed of neutrons is 2.8 m/s The min. uncertainty in measuring the position of the neutron is _____m.An average 56500 photons are detected per square centimeter on imaging plate. What is the chance that a student will detect between 56024 and 56500 photons on the same square area during future measurement?