Barely Significant

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As can be seen, with the increase in the inclination of the well, the force required to break the rock first follows a decreasing trend, and then it increases, which is reasonable considering the change in vertical stress from the pressure of the fluid column to the stress caused by the weight of the overburdened rock, but this increase in the model presented by Xin Ling is such that the reduction of the cutting force that is required to break the rock eventually occurs up to the well inclination of about 10° and then the increasing trend becomes so intense that the order of the numbers changes sharply.
As can be seen, the current model’s trend of changes is such that when σ h < σ v , i.e., σ h = 80 MPa , increasing the well deviation angle up to 30° reduces the difference between the failure angle in the presented model and the model provided by Xin Ling, and, once again, this issue follows an increasing trend from 30° on.
It may be significant that the type of radiation used in this study, moderate energy X-rays, is quite similar to the type of low energy, and largely unfiltered, fluoroscopy X-rays used here 20 , albeit for therapeutic rather than diagnostic purposes, and contrasts with the rather higher energy radiation to which nuclear
The Canadian study also reported an increasing trend for IHD mortality with dose in the entire dose range with an inverse risk modification by dose fractionation using 10-year lag, the evidence for which became much weaker when dose was restricted to less than 0.5 Gy, or when 5-year lag was used 18 .