| 摘要 |
Apparatus for the controllable downhole production of ionizing radiation (12), the apparatus including at least a thermionic emitter (11) which is arranged in a first end portion (7a) of an electrically insulated vacuum container (9), and a lepton target (6) which is arranged in a second end portion (7b) of the electrically insulated vacuum container (9); the thermionic emitter (11) being connected to a series of serially connected negative electrical-potential-increasing elements (141, 142, 143, 144), each of said electrical-potential-increasing elements (141, 142, 143, 144) being arranged to increase an applied direct-current potential (δV0, δV1, δV1+2, . . . , δV1+2+3) by transforming an applied, driving voltage (VAC), and to transmit the increased, negative direct-current potential (δV1, δV1+2, . . . , δV1+2+3+4) and also the driving voltage (VAC) to the next unit in the series of serially connected elements (141, 142, 143, 144, 5), and the ionizing radiation (12) exceeding 200 keV with a predominant portion of the spectral distribution within the Compton range. |
