【摘要】 <正> 输油管道在铺设过程中,常有泥、沙、石块等各种杂物落入管内。在输油前,如不清除这些杂物,在输油过程中,就会引起油管阀门的切换失效。故在油管铺好后,一般都用高压水推动一个和油管内径相同的橡皮球(清管球)或清管器(沈阳东方管道仪器技术开发公司生产),沿油管清除管中污物。过去,有的油管在清管时由于清管球被“卡死”在管中,不得更多还原

【Abstract】 Several technical problems of γ-tagged cleaning ball on petroleum pipe are summarized. Among them, the half-thickness of cobalt-60 γ-rays in wet soil, the responsiveness of some Chinese γ-radiation dosimeters to moving γ-source and some distance-protection measures in operation of 1.2×1010 Bq cobalt-60 source in situ of petroleum pipe are reported.更多还原