Develop a simple sketch of the necessary two-stage well point system.

Well points are to be used to dewater a large trench excavation that

extends 10 m below the surface of the water table. Assume that the

bottom width of the trench excavation is 20 m.

(1) Develop a simple sketch of the necessary two-stage well point sys-

tem. Use separate diagrams to show the progress of the necessary

stages of installation.

(2) Assume that half of the necessary lowering of the water table eleva-

tion is achieved using the outer row of well points. If the soil being

dewatered is a fine-to-medium sand, approximately at what dis-

tance beyond the well point location is the original groundwater

table that is not affected by well point dewatering?

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….