Patricia B Scott and J R Greening 1963 Phys. Med. Biol. 8 51 doi:10.1088/0031-9155/8/1/304
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.
Issue 1 (April 1963)
Received 5 December 1962
Patricia B Scott and J R Greening 1963 Phys. Med. Biol. 8 51
Mirza Pasovic et al 2011 Phys. Med. Biol. 56 3163
Valeria Garbin et al 2011 Phys. Med. Biol. 56 6161
Beau A Standish et al 2010 Phys. Med. Biol. 55 615
Derek Magee et al 2010 Phys. Med. Biol. 55 4755
Ian Cowley and Simon Thomas 2006 Phys. Med. Biol. 51 N17
K H W J Ten Tusscher and A V Panfilov 2006 Phys. Med. Biol. 51 6141
I El Naqa et al 2005 Phys. Med. Biol. 50 909
Gil Schwarzband and Nahum Kiryati 2005 Phys. Med. Biol. 50 5307
Srijit Kamath et al 2004 Phys. Med. Biol. 49 N7