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瞬发裂变中子测井
释义
瞬发裂变中子测井
Encyclopedia
理学
铀矿放射性测井
释
prompt fission neutron logging
瞬发裂变中子测井
在井孔中开展的中子测量方法。该法利用脉冲中子源向钻孔周围的地层发射快中子,快中子被地层慢化后形成热中子群,热中子引发地层235U发生裂变反应,探测裂变反应过程中瞬时(约10-14秒)发射出来的裂变中子,该裂变中子称为瞬发裂变中子(约占235U裂变反应所能发射的全部裂变中子总量的99%以上),故称瞬发裂变中子测井。
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unequal crossing over
unequal deformation
unequal fission
unequally distant
unequal projection
unequal strain
unequal stress
unequal subclasses
unequal subclass numbers
UNESCO
UNESCO Asia-Pacific Awards for Cultural Heritage Conservation
UNESCO Courier
UNESCO Creative Cities Network
UNESCO General History of Africa
UNESCO Information for All Programme
UNESCO initiative on heritage of religious interest
UNESCO Longmen Grottoes protection and restoration project
UNESCO-UNEVOC International Centre for Technical and Vocational Education and Training
UNESCO World Heritage and Sustainable Tourism Programme
unessential
unessential expansion
unessential singularity
U-network
uneven
uneven-aged forest
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