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Detectors
Published in C. R. Kitchin, Astrophysical Techniques, 2020
The unit of intensity that is commonly used at radio wavelengths as a measure of the intensity of point sources is the jansky (Jy) () 1Jy=10−26Wm−2Hz−1
What Is Infrared?
Published in Monroe Schlessinger, Infrared Technology Fundamentals, 2019
The Jansky is a term used by astronomers, with a value of 10−26 W/m2 Hz. If a measurement has a spectral areance [irradiance] of 2.2 Janskys, the use of the term spectral areance immediately flags the measurement as flux per unit area. The method of converting 2.2 Janskys at 10 μm to 6.6 × 10−20 W/cm2 cm−1 is detailed below.
Introductory Material
Published in Ronald L. Snell, Stanley E. Kurtz, Jonathan M. Marr, Fundamentals of Radio Astronomy, 2019
Ronald L. Snell, Stanley E. Kurtz, Jonathan M. Marr
Radio astronomers never adopted this practice of using magnitudes for flux density, but instead use real physical units of flux density. For astronomical sources at radio wavelengths, the flux density, or the amount of energy we receive per unit time per unit area and per unit frequency interval is very small, so in either cgs or SI units the flux density is an awkwardly small number. For this reason a new unit of flux density was defined, and this unit was called the jansky (Jy), Jansky (Jy)Units!jansky (Jy) in honor of Karl Jansky. A jansky is defined as 1Jy=1×10−23ergs−1cm−2Hz−1=1×10−26W−1m−2Hz−1.Note that a jansky is a measure of flux per unit frequency interval. The jansky is also commonly used at infrared wavelengths to measure flux density.Flux density
Preliminary Validation of the Shift Monte Carlo Code for Fixed-Source Radiation Transport Problems
Published in Nuclear Technology, 2020
Douglas E. Peplow, Kaushik Banerjee, Gregory G. Davidson, Ian R. Stewart, Mathew W. Swinney, Jackson N. Wagner
The leakage spectrum of 252Cf neutrons through a 15-cm-radius sphere filled with heavy water was measured by Jansky et al.,10 and the derived neutron flux values were compared with MCNP calculations using ENDF/B-IV and ENDF/B-VI nuclear data. The leakage neutron spectrum was measured using a proton recoil spectrometer.