#research #shielding/material See also: # Borated Polyethylene Motivation: studying shielding in a bit more detail for the [[3D CZT for Radiography Imaging Project MOC|3D CZT LINAC Measurement Project]] Borated Polyewthylene is a material made up of polyethylene chains $(C_2H_4)_n$ with Boron (5% by weight usually) attached every son often in order to capture thermal neutrons. ## Attenuation Borated Polyethylene [[Linear Attenuation Coefficient]] has a similar properties to that of Polyethylene:  ## Managing Capture Gammas In the context of the Radiogrpahy measurement, if we want to shield the detector from neutrons, we must consider some capture gamma rays at ==0.477 MeV from Boron, 2.2 MeV from Hydrogen, and 4.43 MeV from Carbon==: >"Boron is one such material and is generally used as a [neutron absorber](https://www.sciencedirect.com/topics/physics-and-astronomy/neutron-absorber "Learn more about neutron absorber from ScienceDirect's AI-generated Topic Pages"). In the present work attempts have been made using theoretical simulations to demonstrate the improvement in energy response achieved by using borated high density polyethylene (BHDPE) over the normal HDPE samples in estimating neutron ambient dose equivalent from the measured peak intensities of the characteristic prompt gamma rays emitted from boron (0.477 MeV), hydrogen (2.2 MeV) and carbon (4.43 MeV) nuclei present in the sample. The responses of boron, hydrogen and carbon to mono energetic neutrons of different energies are estimated by simulations using the Monte Carlo code FLUKA" >- [[@priyada_use_2016]] ## GEANT4 Definition ``` "Borated Polyethyl." 5 0.95 #. 5%-borated polyethylene (BPE) "Hydrogen" 11.6 #. C.R.Wuest SSCL-GEM TN 92-172. "Carbon" 61.2 #. "Boron" 5.0 #. Weight fraction GMIX "Oxygen" 22.2 #. Weight fraction GMIX ```