Surface barrier lithium drifted silicon detector with evaporated guard ring

1970 ◽  
Vol 77 (1) ◽  
pp. 21-28 ◽  
Author(s):  
E. Belcarz ◽  
J. Chwaszczewska ◽  
M. Słapa ◽  
M. Szymczak ◽  
J. Tys
Keyword(s):  
Silicon Detector ◽  
Surface Barrier ◽  
Guard Ring

A Preliminary Observation on AgGaSe2 as a Nuclear Radiation Detector

1982 ◽  
Vol 16 ◽  
Author(s):  
Eiji Sakai ◽  
Hiromichi Horinaka ◽  
Hajimu Sonomura ◽  
Takeshi Miyauchi
Keyword(s):  
Radiation Detector ◽  
Silicon Detector ◽  
Alpha Particles ◽  
Nuclear Radiation ◽  
Surface Barrier ◽  
Applied Bias Voltage ◽  
Nuclear Radiation Detector ◽  
Barrier Detector ◽  
Temperature Noise ◽  
Silicon Surface Barrier Detector

ABSTRACTAn about 108 ohm-cm AgGaSe2 crystal of 0.5 mm × 4 mm × 4 mm was polished and contacts were made by evaporating 130 μg/cm2 gold of 3 mm diameter on the two faces of the crystal. The detector was tested using 5.5 MeV alpha-particles at room temperature. Noise increased above an applied bias voltage of 80 V. For + 50 V applied on the electrode opposite to the particle incident electrode, i.e., for electron traversal mode, the preamplifier output pulses showed a risetime of 20 μs and an amplitude of about one-tenth of that obtained from a silicon surface-barrier detector whereas the silicon detector showed a risetime of 0.07 μs. For - 50 V applied on the same electrode, i.e., for hole traversal mode, no pulses were observed.

Stopping Power of Alpha Particles in Helium Gas

2020 ◽  
pp. 117-125
Author(s):  
M.Q. Hiwa
Keyword(s):  
Charged Particle ◽  
Energy Loss ◽  
Alpha Particle ◽  
Vacuum Chamber ◽  
Silicon Detector ◽  
Alpha Particles ◽  
Lower Pressure ◽  
Stopping Power ◽  
Surface Barrier ◽  
Helium Gas

The stopping power and the range of alpha particles emitted from Am-241 source has been investigated in helium gas at different pressures of 0 to 1 bar, using surface barrier silicon detector in the large vacuum chamber. The energy loss has also been obtained at variable distances from 2 to 8 cm. It is observed that as the pressure in a large vacuum chamber increases, the energy loss of the alpha particle decreases. The measured energy loss of alpha particles at lower pressure of 0 bar is less, but at higher pressure of 1 bar is more. As expected from Bethe --- Bloch formula, the stopping power of charged particle in helium gas at different pressure was found to increase significantly when pressure is increased. The measured value of stopping power and range were compared with SRIM and theoretical value. The experimental value of stopping power and range was found to be very close to the SRIM and theoretical value. Then, the measured value of range was compared with experimental using the Bragg --- Kleeman's rule

Data Acquisition and Handling Unit for a Quantitative Use of Electron Energy Loss Spectroscopy

1977 ◽  
Vol 35 ◽  
pp. 232-233 ◽  
Author(s):  
P. Trebbia ◽  
P. Ballongue ◽  
C. Colliex
Keyword(s):  
Electron Microscope ◽  
Energy Loss ◽  
Electron Energy ◽  
Electron Energy Loss Spectroscopy ◽  
Single Channel ◽  
Detection System ◽  
Surface Barrier ◽  
Solid State Detector ◽  
Electrostatic Mirror ◽  
Electron Energy Loss

An effective use of electron energy loss spectroscopy for chemical characterization of selected areas in the electron microscope can only be achieved with the development of quantitative measurements capabilities.The experimental assembly, which is sketched in Fig.l, has therefore been carried out. It comprises four main elements.The analytical transmission electron microscope is a conventional microscope fitted with a Castaing and Henry dispersive unit (magnetic prism and electrostatic mirror). Recent modifications include the improvement of the vacuum in the specimen chamber (below 10-6 torr) and the adaptation of a new electrostatic mirror.The detection system, similar to the one described by Hermann et al (1), is located in a separate chamber below the fluorescent screen which visualizes the energy loss spectrum. Variable apertures select the electrons, which have lost an energy AE within an energy window smaller than 1 eV, in front of a surface barrier solid state detector RTC BPY 52 100 S.Q. The saw tooth signal delivered by a charge sensitive preamplifier (decay time of 5.10-5 S) is amplified, shaped into a gaussian profile through an active filter and counted by a single channel analyser.

CALCULATION OF STAGES OF THE TECHNOLOGICAL PROCESS OF MANUFACTURE OF PPD DETECTORS USING COMPUTER MATHEMATICAL MODELING AND PRODUCTION OF ALPHA RADIOMETER ON THEIR BASIS

2020 ◽  
Vol 7 (2) ◽  
pp. 21-28
Author(s):  
SALI RADZHAPOV ◽  
◽  
RUSTAM RAKHIMOV ◽  
BEGJAN RADZHAPOV ◽  
MARS ZUFAROV
Keyword(s):  
Mathematical Modeling ◽  
Technological Process ◽  
Block Diagram ◽  
Large Diameter ◽  
Silicon Detector ◽  
Digital Processing ◽  
Main Element ◽  
Alpha Radiation ◽  
Initial Silicon ◽  
Natural Isotopes

The article describes the developed radiometer for Express measurement of alpha radiation of radioactive elements based on a large-diameter silicon detector. The main element of the PPD detector is made using computer mathematical modeling of all stages of the technological process of manufacturing detectors, taking into account at each stage the degree of influence of the properties of the initial silicon on the electrophysical and radiometric characteristics of the detector. Detectors are manufactured for certain types of devices. The developed radiometer is designed to measure alpha radiation of natural isotopes (238U, 234U, 232Th, 226Ra, 222Rn, 218Po, 214Bi, etc.) in various environments. It also shows the principle of operation of the device, provides a block diagram of the measuring complex, describes the electronic components of the radiometer, as well as the block diagram. Signal transformations (spectrum transfer, filtering, accumulation) are implemented programmatically on the basis of a digital processing module. The device can detect the presence of specific elements in various environments, as well as protect people from the harmful effects of adverse radiation and can be used both in the field and stationary.

Erratum: High-gain GaInP/GaAs heterojunction phototransistor utilising guard-ring structure

1989 ◽  
Vol 25 (4) ◽  
pp. 296
Author(s):  
J.K. Twynam ◽  
P.A. Claxton ◽  
R.C. Woods ◽  
D.R. Wight
Keyword(s):  
High Gain ◽  
Ring Structure ◽  
Guard Ring

Branching Ratios and Lifetimes of 25Mg Levels below 5.2 MeV

1974 ◽  
Vol 52 (23) ◽  
pp. 2329-2342 ◽  
Author(s):  
R. W. Ollerhead ◽  
D. C. Kean ◽  
R. M. Gorman ◽  
M. B. Thomson
Keyword(s):  
Doppler Shift ◽  
Gamma Ray ◽  
Branching Ratios ◽  
Surface Barrier ◽  
Surface Barrier Detector ◽  
Rotational Model ◽  
Rotational Bands ◽  
Barrier Detector ◽  
Combined Data

All levels below 5.2 MeV in 25Mg have been studied using the reaction 25Mg(p, p′γ). In-elastically scattered protons were detected in an annular surface barrier detector located at 180°; coincidence gamma-ray spectra were obtained at Ge (Li) detector angles of 90°, 45°, and 135°. Level energies were determined from unshifted gamma-ray energies recorded in the 90° spectra. Lifetimes were obtained from the attenuated Doppler shift of gamma-ray energies recorded in spectra taken at forward and backward angles. Branching ratios were deduced from the combined data of all three angles. The identification of levels as members of rotational bands is discussed, and transition strengths deduced from the present measurements are compared with predictions of the simple rotational model.

scholarly journals Winter rye tolerance to low temperatures after seed treatment with surface barrier discharge

2021 ◽  
Vol 1787 (1) ◽  
pp. 012064
Author(s):  
S V Gundareva ◽  
A V Lazukin ◽  
N V Dorofeev ◽  
A G Romanov ◽  
S A Krivov
Keyword(s):  
Low Temperatures ◽  
Seed Treatment ◽  
Barrier Discharge ◽  
Surface Barrier ◽  
Winter Rye ◽  
Surface Barrier Discharge
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