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References in periodicals archive ?
ion chamber survey meters with a beta response and accessories (herein
KPT was the correction computed from the expression KPT = (273.5+T)/(273.5+T0) x Po / P where To is standard temperature (To = 22AdegC) and Po is standard pressure which is 101.33 kPa (kilo pascal, 1 standard atmosphere = 760 mm of Hg = 101.33 kPa), T is temperature of water inside an ion chamber, taken as the temperature of the surrounding water and P, assumed to be the local air pressure, is the pressure inside the ion chamber.
This was accomplished with the development of an e-gun design that removes the link between the energy of the electrons and the ionization efficiency by introducing an additional electrostatic element between the e-gun and the ion chamber. This allows the ionization energy of the electrons to be varied on a sliding scale from conventional 70 eV to lower energies, without loss of sensitivity.
3, [K.sub.cyl] = 1.06 is a field distortion factor for a cylindrical ion chamber, itself a function of a and b, V = 300 V is the applied voltage during charge collection, and k is the mean (positive) ion mobility for free air, taken to be 1.3 [cm.sup.2][s.sup.-1] [V.sup.-1] [18].
The literature from the manufacturer shows that this ion chamber model typically has energy dependence better than 1%.
Another device is the electric ion chamber, which is based on an electrostatic charge and gives an immediate reading.
EPA guidelines suggest a long-term test, in which an alpha track or electret ion chamber detector remains in place for more than 90 days.
The calibration of megavoltage beams from linear accelerators has three essential requirements: (i) the use of an ion chamber with a calibration traceable to an SSDL; (ii) an accurate experimental setup; and, (iii) the correct interpretation of the dosimetry protocol to determine and correctly apply the factors to convert the charge reading to the absorbed dose in water at the calibration point.
The DAP meter was calibrated with a reference ion chamber at 72 cm from the focal spot.
In effect, the specialties of the ion chamber to detect invisible particles of combustion, is combined with the photoelectric chamber to detect visible particles and also combined with a thermistor rate of rise temperature sensor.
This contract will aim to carry out studies for: - the replacement of the existing fire station with a new one, the installation of alarm reports, removal of existing power plants, - regulatory compliance of the establishment, smoke removal of compartmentalized zones - migration of ion chamber smoke detectors - follow-up of works, acceptance of works and participation in the security commission
3.) The neutron beam intensity is measured with a [.sup.3]He ionization chamber upstream and downstream of the polarizer cell, and again at the end of the beamline with a third ion chamber. The transmission of the [.sup.3]He cell serves as an on-line measurement of its polarization and hence that of the neutron beam.