flask

New imaging scintillators for high energy, multi-pulse flash radiography

Description:

The Single Crystal Growth Laboratory at LANL has a substantial history of development of new scintillators and development of fabrication technology for different detector geometries and formats. It is in this lab that the student will work in a small team environment to support this project for new imaging scintillators for high energy, multi-pulse flash radiography. The student will work with staff members to grow single crystals of various materials and prepare those crystals for performance characterization. This will involve calculating and preparing charge material of complex, multi-component oxide materials, such as garnets and perovskites, followed by crystal growth and then preparing samples from the crystals for subsequent optical, chemical and microstructural characterization.

Completion Objectives:

  • The student will participate in developing joining technologies to enable “gluing” of single crystal tiles into larger format arrays. Key requirements for the joints include mechanical strength as well as high optical perfection. To this end, basic material and processing properties will be measured for a range of high index of refraction glasses and joining protocols will be developed meet the optical and mechanical requirements of the tile joints. The student will also interface with other teams that will measure the overall optical performance of the tiled array, e .g. assess “tile glow.”
  • The student will also contribute to development of processing procedures to produce adherent, polycrystalline scintillator films for lower energy imaging applications. Again, the student will interface with other teams to measure the overall optical performance of the imaging screens.
  • The student, after initial OJT, will be expected to work substantially independently. It is anticipated that the student will complete at least one sample cycle (charge preparation, growth and sample preparation) on a weekly basis. As the student will be contributing to the multiple studies that are part of the larger scintillator development project, the ability to efficiently plan and manage her time as she works on multiple tasks in parallel. The student will compile background information, maintain detailed experimental records, and organize and present experimental results to the development team. An expected outcome at the end of the summer is a written report summarizing her studies.

Faculty Advisor:

Rockstraw

Required Competencies

CHME undergraduate having completed sophomore coursework

Student Researcher:

Kimberly Pestovich


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