How do you calculate efficiency of a detector?

the efficiency of the detector for radiation from the sample must be calculated using formula ε(E) = ω ε0(E), finding the value of the coefficient ω for the relation (2). For a cylindrical container l = H and for a complex-shaped container l = H – h.

What is detection efficiency?

“Detection efficiency” is defined as the ratio of the output signals to incident electrons, X-rays or photons to a detector (input signals). A detector with high detection efficiency meets various requirements, such as high conversion efficiency from input to output, short dead time, and low noise.

What is the efficiency of a radiation detector?

For incident charged particles such as alpha particles or beta particles, many detectors have a total efficiency that is close to 100 percent.

Which detector has very good resolution and efficiency?

High purity germanium detector has better resolution compared to the scintillation type of detector, Sodium iodide (NaI). The HPGe detector offers the advantage of resolving two closely located energy points and has the ability to detect a mixture of nuclear material.

What is efficiency calibration?

The efficiency of a detector is a measure of how many pulses occur for a given number of γ- or x-rays. The efficiency calibration of HpGe detector was measured by using standard gamma point sources with exactly the same geometry, density and chemical composition as sample under study.

What is efficiency of GM counter?

The efficiency, i. e. the counting probability per one quantum of the thick-walled γ-ray counter was computed theoretically by making some simplifying assumptions for several energies between 10 mc 2 and 34 mc 2 (Li-p γ-ray) and for different wall thickness.

What are the factors that contribute to detector efficiency?

The closer the source is to the detector, the larger the efficiency will be. 2. The size of the detector: Larger detectors will usually be more efficient, since they have a larger volume for the particles to absorbed in. 3.

How do you calculate GM counter efficiency?

Calculation of the G-M Tube Efficiency The number of detected counts is the counts/s for the radiation source minus the background counts/s. The number of radiation disintegrations is the current activity of the source multiplied by the fraction of the source radiation incident on the G-M end window.

What is difference between resolution and efficiency?

Well, first the bad news: resolution is not directly proportional to efficiency. Based on the general resolution equation (Equation 1) this means that every time the efficiency (N) is doubled, the resolution only increases by a factor of 1.41. Ironically, efficiency is not a very efficient way of obtaining resolution!

What is NaI detector?

A NaI(Tl) scintillation counter is a radiation detector which uses the effect known as scintillation. Scintillation, which occurs in the NaI(Tl) crystal, is a flash of light produced in a transparent material by the passage of a particle (an electron, an alpha particle, an ion, or a high-energy photon).