Simulation and experiment on measuring the grease stain thickness by acute angle incidence method

By iron bar presenting oil tube, making acute angle scattering experiment on measuring grease stain by using oil crust, and a MCNP simulation of the experiment was made in the same geometrical condition to observe the relationship between scattering photon numbers and grease stain thickness. The result shows that experiment and simulation result fits very well. Especially for 45 incident angle the value of R2 is, on the whole,bigger than 0.99, means that 45 incident angle is a good choice for the linear relationship between scattering photon numbers and grease stain thickness. Acute angle scattering is feasible. (authors)