Which of the following statements is false regarding exposure and dose to air or soft tissue? the mass energy absorption coefficients (hp) for air and soft tissue are approximately equal over a broad range of photon energies the definition 1 r 2.58x104 c kgestablishes an approximate equality between exposure in the unit of roentgen and dose to soft tissue under the condition of charged particle equilibrium and in units of rad or rem exposure in the unit of roentgen is a factor of 1.14 greater than the dose to air under the condition of charged particle equilibrium and in the unit of rad a. c b. d. the average energy required to produce one coulomb of charge in dry air is 33.7 j exposure is defined for any form of uncharged ionizing radiation that can produce ion pairs in air