Modification of Color Centers by Electron Bombardment: Final Report CRADA No. TC-0460-93-A
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Quali-Tech, Inc., Columbia, MO (United States)
The purpose of the project was to: Identify those electron beam irradiation parameters most relevant to process quality and efficiency, to producing and modifying color centers in topaz. Develop and test improved radiation processing techniques, and evaluate their potential applicability to other types of semi-precious gems. Develop an optimized data base for the process and procedures for identifying and characterizing material from new and diverse sources. Transfer new processing technology to the private sector, and, until they are implemented industrially, to perform radiation dosing to partially satisfy existing excess demand. We planned to define the interaction between sample purity level, the physics of irradiation to achieve color cent-er modification on a reproducible basis and demonstration of the resulting process on a commercially viable basis. The primary deliverable was the increased knowledge base in terms of expanded understanding of the systematics of color center modification in materials, and an extensive database of electron beam parameters which would optimize the efficiency and quality of radiation processing of topaz from diverse sources. The radiation processing of these stones constitutes a deliverable to Quali-Tech by LLNL.
- Research Organization:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Quali-Tech, Inc., Columbia, MO (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC52-07NA27344
- OSTI ID:
- 1410053
- Report Number(s):
- LLNL-TR-742008; UCRL-ID-142848
- Country of Publication:
- United States
- Language:
- English
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