(b) Assume that a source is detected against a strong background (an examplewould be the case of mid-infrared observations made from the ground). Assumethat the number of counts detected on-source in time, At, is (S + B), and thenumber of counts detected from the background in the same interval (measuredfrom an adjacent patch of sky) is B.What is the variance on the difference between the two measurements? Hencecalculate the significance for a source detection (i.e., signal / standarddeviation) and show that in the case of high background relative to the sourcethis can be represented in terms of the source and background count rates (rsand r3, respectively) by:Ts VAt/2 TBSOB

Given: The number of counts detected o-source is S+B. The number of counts detected from the…

Answered: (b) Assume that a source is detected…

Similar questions

In a controlled fusion reactor Deuterium-Tritium The temperature of the plasma is T = 10 keV, where k is the k Boltzmann constant. The ions' number density is 2.6×10¹8 m-3. -22 3 Moreover (ov) = 10-²²m³s-¹, where o is the reaction cross-section, v is the relative speed of the reacting particles, and represents averaging according to the Maxwell- Boltzmann distribution. fusion is occurring. For what value of the confinement time does the reactor achieve the break even point? Enter your answer in seconds to 1 decimal point.
The Geiger counter has a cylindrical detecting volume of length 3.4 cm and diameter 1.4 cm. Lisa estimates the number of events that her body would detect, for a measured background rate of 14.4 cpm, by regarding its volume as a collection of many such tubes. She treats her volume as a box of height 157 cm, width 35 cm, and depth 17 cm. How many external radiation events does it register per minute? HINT: By what factor is Lisa's body larger than the Geiger counter?
A point Source emitting 5 of neutrons, is placed at the Center of sphere of moderator radius R. show that; Ø S что sinh CRtd-r) sin h (Rtd)
Tungsten has a linear attenuation coefficient of 30.5/cm for gamma rays with 150 keV of energy. If an unshielded Tc-99m syringe has a radiation exposure rate (I(0)) of 34 mR/hr, what will be the exposure rate if a 0.25-cm tungsten shield is placed around it? Using the calculation above, how much (what percent) is transmitted through the shield? What percent is attenuated?
We saw that, on Earth, the number flux of solar neutrinos from the p-p chain is 6.7E10 s-1 cm-2. Other nuclear reactions in the Sun supplement this neutrino flux with a small additional flux of higher-energy neutrinos. A neutrino detector in Japan, named Super Kamiokande, consists of a tank of 50kton of water, surrounded by photomultiplier tubes. The tubes detect the flash of Cerenkov radiation emitted by a recoiling electron when a high-energy neutrino scatters on it. Calculate the detection rate for neutrino scattering in events per day, if 10-6 of the solar neutrinos have a high enough energy to be detected by this experiment, and each electron poses a scattering cross section=10-43 cm. Hint: Consider the density of neutrino targets "seen" by an individual electron, with a relative velocity of c between the neutrinos and the electron, to obtain the rate at which one electron interacts with the incoming neutrinos, and multiply by the total number of electrons (I've already done this:…
The following expressions give the functional dependence of the energy generation rate, e, on density and temperature for the proton-proton chain and the CNO cycle. Proton-proton chain: e = €opT4 CNO cycle: e = eopT16 Write down the corresponding expression for the triple alpha process, and explain why its functional form differs in this manner from the other two processes.