نتایج جستجو برای: radiation detector
تعداد نتایج: 291530 فیلتر نتایج به سال:
in this research work, alpha particle detector is made using semi-insulating gaas. a surface barrier detector with a semi-insulating gaas substrate at room temperature with pressure of 10-4 torr under -particle radiation with 5.48 mev of am241 source, have been under investigation. energy resolution of 2 and 3 mm schottky diameter have been matured and compared with the effect of voltage varia...
Many detection methods have been applied to detect radon gas. Due to the low noise and high resolution of gas detectors compared to semiconductor detectors or scintillation detectors, using them to detect alpha radiation is very considerable. Microstrip proportional detector is also included in this group and it has not been used for the detection of radon. In this article, response of the micr...
Introduction: This study was conducted to measure the gamma emitters (e.g., uranium-238 [238U], thorium-232 [232Th], and potassium-40[40K]) and alpha emitters (e.g., radon-222 [222Rn] and radium), and also to evaluate the radiation hazard indices of radionuclides in parenteral nutrition samples utilized in the hospitals of Iraq. Material and Methods: The measurements were accomplished using ga...
Abstract. For the experimental measurements of pyroelectric detectors voltage responsivity, sinusoidal modulated optical radiation should be used. In practice, optical choppers are commonly used in experimental set-ups to modulate optical source and as a result optical radiation may have a square or trapezoidal waveform. In the paper, the frequency dependence of voltage responsivity of pyroelec...
The Collider Detector at Fermilab (CDF) radiation hardened silicon vertex detector (SVX’) is described. The new detector has several improvements over its predecessor such as better signal to noise and higher efficiency. It is expected to have a radiation tolerance in excess of 1 Mrad. It has been taking data for several months and some preliminary results are shown.
A new silicon microstrip detector was designed by the CDF collaboration for the proposed high-luminosity operation of the Tevatron pp̄ collider (Run IIb). The detector is radiation-tolerant and will still be functional after exposure to particle fluences of 10 1-MeV equivalent neutrons=cm and radiation doses of 20MRad. The detector will maintain or exceed the performance of the current CDF silic...
The optimum design, construction, and use of the LIGO, VIRGO, or LAGOS gravitational radiation detectors depends upon accurate calculations of their sensitivity to different sources of radiation. Here I examine how to determine the sensitivity of these instruments to sources of gravitational radiation by considering the process by which data are analyzed in a noisy detector. The problem of dete...
PURPOSE To determine the potentialities of synthetic single crystal diamond Schottky diodes for accurate dose measurements in radiation therapy small photon beams. METHODS The dosimetric properties of a diamond-based detector were assessed by comparison with a reference microionization chamber. The diamond device was operated at zero bias voltage under irradiation with high-energy radiotherap...
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