Which of the following is the disadvantages of solid state semiconductor detector?

Explanation: The main disadvantage of solid state semiconductor detector is that it must be maintained at low temperature. This is necessary to reduce noise and to prevent deterioration of detector characteristics.

What are the advantages of semiconductor detector?

Advantages of the Semiconductor Detector

High counting rates of the order of 5 * 104 counts per second as possible without any difficulty. These have low sensitivity to γ-background radiation. They do not need any window for letting the charged particles into the detector. These have very good energy resolution.

Why are Si Li detectors important and what are their advantages and disadvantages?

The silicon detectors are mechanically rigid and therefore no special supporting structures are needed. Silicon-based detectors are very good for tracking charged particles, they constitute a substantial part of detection system at the LHC in CERN. Silicon detectors can be used in strong magnetic fields.

What are semiconductor detectors used for?

Semiconductor detectors are widely used in radiation protection, assay of radioactive materials and physics research because they have some unique features, can be made inexpensively yet with good efficiency, and can measure both the intensity and the energy of incident radiation.

What are the advantages and disadvantages of semiconductor devices?

Semiconductor devices have no filaments hence there is no power needed to heat them to cause the emission of the electrons. As we know the semiconductor device does not produce any humming noise. Semiconductor devices have shockproof. The semiconductor device is cheaper as compared to vacuum tubes.

What are the advantages and disadvantages of energy band gap of a semiconductor?

The materials with a bandgap less than 3.0eV are considered Semiconductors. The valence electrons do not gain enough energy to jump to the conduction band and participate in the current process. Since the Bandgap is less than the insulators, some of the electrons can participate in the current process.

What is silicon surface barrier detector?

Surface barrier detectors are diodes of the p–n or p–i–n type that are reverse-biased. Collisions between high-energy C3 + particles and the detector produce pairs of positive ‘holes’ and electrons in the silicon lattice with an average energy of ~ 3.6 eV.

What are the three types of semiconductor detectors?

Contents
  • 2.1 Silicon detectors.
  • 2.2 Diamond detectors.
  • 2.3 Germanium detectors.
  • 2.4 Cadmium telluride and cadmium zinc telluride detectors.

What is silicon diode detector?

Silicon diode detectors have the advantages of high resolution, large signal, and fast response, but lack the flat energy response of the Farmer ion chamber. … The energy response of the unshielded diode was quantitated over a range of energies from 18.5 keV to 8 MeV.

How does a high purity germanium detector work?

HPGe Detector – Principle of Operation

Ionizing radiation enters the sensitive volume (germanium crystal) of the detector and interacts with the semiconductor material. High-energy photon passing through the detector ionizes the atoms of semiconductor, producing the electron-hole pairs.

What is electronic surface barrier?

[′sər·fəs ‚bar·ē·ər] (electronics) A potential barrier formed at a surface of a semiconductor by the trapping of carriers at the surface.

What is surface barrier in physics 12?

Solution. To leave the metallic surface, the free electrons must cross a potential barrier created by the positive nuclei of the metal. The potential barrier which prevents free electrons from leaving the metallic surface is called the surface barrier.

What is a germanium detector?

Germanium detectors are semiconductor diodes having a p-i-n structure in which the intrinsic (i) region is sensitive to ionizing radiation, particularly x rays and gamma rays. Under reverse bias, an electric field extends across the intrinsic or depleted region.

What is the working principle of a semiconductor detector justify why high purity germanium detectors need to be operated at approximately liquid nitrogen temperatures?

Parts of HPGe Detectors. The major drawback of germanium detectors is that they must be cooled to liquid nitrogen temperatures. Because germanium has relatively low band gap, these detectors must be cooled in order to reduce the thermal generation of charge carriers to an acceptable level.

Which detector has best energy resolution?

Planar detectors usually achieve the best energy resolution, because of their low capacitance; they are preferred for detailed spectroscopy, such as the analysis of the complex low-energy gamma-ray and x-ray spectra of uranium and plutonium.

How radiation signal is generated in a silicon detector?

In semiconductor detectors, an electric field is present throughout the active volume. The subsequent drift of the electrons and holes toward electrodes on the surface of the semiconductor material generates a current pulse in much the same manner as the motion of ion pairs in a gas-filled ion chamber.

What is SSD detector?

Solid-state semiconductor detectors are radiation detectors which employs a semiconductor material as the detecting medium. These detectors produce pulse of electric current by means of pairs of charge carriers, electrons and holes, generated when the detectors come in contact with ionizing radiation.

What is sodium iodide detectors?

A 2×2 inch sodium iodide (NaI) detector will allow the user to identify the presence of Cs137 at < 1 urem/hr/sec. The 3×3 inch NaI detector can identify Cs137 at 500 nrem/hr/sec. This is why BNC’s SAM III generation and SAM 940 are designed to easily hold large detectors and operate them with one hand.

Which one of the following is not a radiation sensor?

1. Which of the following is not a type of radiation detector? (a) Geiger Muller (G.M.) counter (b) Proportional counter (c) Semiconductor radiation detector (d) Flame emission detector View Answer Answer: d Explanation: Flame emission detector is not a type of radiation detector.

How germanium detectors are more suitable than silicon detectors for detection of electromagnetic radiation?

Germanium detectors

With an atomic number of 32, germanium has a much higher photoelectric cross section than silicon (atomic number, Z, of 14), as the probability of photoelectron absorption varies approximately as Z4.5. … In gamma-ray spectroscopy, there is an advantage in using detectors with a large active volume.

What is depletion region in semiconductor?

[ dĭ-plē′shən ] A region in a semiconductor device, usually at the juncture of P-type and N-type materials, in which there is neither an excess of electrons nor of holes. Large depletion regions inhibit current flow.