6. (a) What is the density of air at 650 torr, 23.5C, 45% RH? (b) What is (W/e)air for low-LET radiation at this humidity? (c) What is the percentage error in the density if the humidity is assumed to be zero? (d) Assume that a charge of8.65 x 10-C is measured from a cavity chamber filled with the air in part (a). For the same irradiation, what charge would be measured if the chamber were filled with dry air at 760 torr, 22C? (e) What is the absorbed dose in the humid air in (d) if the chamber volume is 3 cm and recombination is nil? Answers: 6. (a) 1.012 kg/m'. (b) 33.7 J/C. (c) p is 0.6% too high. (d) 1.014 x 10 -" C . 9.60 x 10 * Gy