Cracking Cause of Neutron and Gamma Ray Shielding Material Composing of High-Density Cement, Crumb Rubber and Lead
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Abstract
The cause of the crack under neutron and photon flux of neutron and gamma ray shielding material composing of high-density cement mixed with 5% waste rubber and various percentages of lead powder was investigated. This shielding material was designed and fabricated in our prior work to shield against radiation from synchrotron accelerator. The lead percentages of 2, 4, 6 and 8 wt.% were studied. It was found that with the lead content of at least 4 wt.%, the shielding material cracked under neutron and gamma-ray irradiation. The crystalline phases as well as elemental composition of the shielding material were determined by quantitative X-ray diffraction technique (QXRD). Results revealed the following crystalline phases: barite, portlandite, quartz, calcite, lead and PbO2. Experimental tests were performed to determine the physical bonding of lead power to high-density cement. Results revealed that lead powder exhibited very weak adhesion to the cement, indicating that the poor mechanical interface was the underlying cause of cracking. These data will be helpful in developing this class of radiation shielding material to prevent the cracking problem.
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