Organic conductors are promising candidates for gamma dosimetry in the range of 10⁴ to 10⁸ Gy. Their electrical resistance increases with the absorbed dose, and this variation can be predicted theoretically over a large dose range. One of these conductors called (TMTSF)(DMTCNQ) has been tested in the industrial gamma irradiator of reactor Osiris at a temperature of 50°C. The resolution of this absorbed-dose integrator was shown to be better than 10⁴ Gy for a maximum integrated dose of several 10⁷ Gy. The measurement of this dosimeter in situ during irradiation permits accurate monitoring and control of the industrial irradiation plant for a period of several months.