Patricia B Scott and J R Greening 1963 Phys. Med. Biol. 8 51 doi:10.1088/0031-9155/8/1/304
The Determination of Saturation Currents in Free-air Ionization Chambers by Extrapolation Methods
Patricia B Scott and J R Greening
Show affiliationsThe usual method of determining saturation currents in free-air chambers is to plot the reciprocal of the current, j, against the reciprocal of the collecting electric field, E, and extrapolate linearly to 1/E=0. It is shown that this method is valid only if the recombination taking place is initial recombination within ion clusters. Experimental and theoretical evidence is produced to show that in such chambers, at dose rates of 1 r/min or more, it is general (volume) rather than initial recombination which is taking place. Theory shows that under these circumstances one should plot 1/j against 1/E2, or more accurately against j/E2, and extrapolate to 1/E2 or j/E2=0.
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Issue 1 (April 1963)
Received 5 December 1962
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The Determination of Saturation Currents in Free-air Ionization Chambers by Extrapolation Methods
Patricia B Scott and J R Greening 1963 Phys. Med. Biol. 8 51
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