How much final energy are you saving?



1. You are in an area where electricity is predominantly produced from natural gas. Extracting and transporting natural gas has losses of 5 percent, the gas-fired power plant has an efficiency of 45 percent, and the losses of in the electrical infrastructure are 2 percent for AC/DC conversion, 7 percent in transmission and distribution, and 3 percent in wiring. Suppose you upgrade your refrigerator from an 18–cubic foot unit that uses 500 kWh per year to a larger 25–cubic foot unit that uses 350 kWh per year. How much final energy are you saving? How much primary energy?

find the cost of your paper

Explain why attenuation is not a big problem in PET.

Consider a 2-D object consisting of two triangle compartments, as shown in Figure P9.4. Suppose a solution containing a 511 KeV gamma ray emitting radionuclide with concentration f = 0.5….

Give the mean and the variance of the reconstructed image, mean[ˆ f(x, y)] and var[ˆ f(x, y)].

Ignoring the inverse square law and attenuation, an approximate reconstruction for SPECT imaging is given by where c˜() =  {||W()} and W() is a rectangular windowing filter that cuts off at = 0…..

Find the numerical responses in each to an event in crystal C(4, 6).

Suppose a PET detector comprises four square PMTs (arranged as a 2 by 2 matrix) and a single BGO crystal with slits made in such a way that it is….