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  • Title: Effects of boron neutron capture irradiation on the normal lung of rats.
    Author: Kiger JL, Kiger WS, Patel H, Binns PJ, Riley KJ, Hopewell JW, Harling OK, Coderre JA.
    Journal: Appl Radiat Isot; 2004 Nov; 61(5):969-73. PubMed ID: 15308177.
    Abstract:
    The whole lung of rats was irradiated with X-rays, thermal neutrons, or thermal neutrons in the presence of p-boronophenylalanine (BPA). A >/= 20% increase in breathing rate, in the period 40-80 days after irradiation, was indicative of radiation-induced pneumonitis. The ED(50) (+/-SE) for a >/= 20% increase in breathing rate, relative to age-matched controls, was 11.6 +/- 0.13 Gy for X-rays and 9.6 +/- 0.08 Gy for neutrons only. This indicated a thermal neutron beam RBE of 1.2 and an RBE of 2.2 for the high-LET components of the dose, assuming a dose reduction factor of 1.0 for gamma rays. Preliminary data indicate the compound biological effectiveness factor for BPA in the lung is approximately 1.5.
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