Abstract
THE residual current in an ionization chamber, when the pressure is reduced to very low values, has been attributed by Greening1 to the transfer of slow electrons between the electrodes. He correlated several experimental studies2–9 in order to estimate the number of low-energy electrons emitted from unit area of the wall of a vacuum chamber under irradiation. For graphite the emission was about 5 × 105 electrons/cm2/rad (2.5 × 10−4 E.S.U./cm2/rad) and for elektron metal about 1.0 × 106 electrons/cm2/rad (5 × 10−4 E.S.U./cm2/rad), when irradiated by radium γ-rays. From some measurements at reduced pressure in ionization chambers Burlin10 also made an approximate estimate of the slow electron emission and obtained a value of 5 × 10−4 E.S.U./cm2/rad from graphite.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
