In some embodiments, an apparatus includes a radiation source to output radiation after power is supplied. The apparatus also includes a power source to supply power. The apparatus includes an ambient-activated switch electrically coupled between the radiation source and the power source. The ambient-activated switch is to switch to an open position while a value for an ambient charteristic for the ambient-activated switch is at an ambient level for a surface of the Earth. The ambient-activated switch is to switch to a closed position while the value for the ambient characteristic for the ambient-activated switch is at a downhole ambient level, wherein the ambient-activated switch is to electrically couple the power source to the radiation source while in the closed position.
申请公布号
WO2009038554(A1)
申请公布日期
2009.03.26
申请号
WO2007US20225
申请日期
2007.09.18
申请人
HALLIBURTON ENERGY SERVICES, INC.;DORFFER, DANIEL, F.;CRAWFORD, DONALD, L.