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KMID : 1039220230330040439
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Journal of Korean Society of Occupational and Environmental Hygiene
2023 Volume.33 No. 4 p.439 ~ p.446
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Characterization of X-ray Emitted in the Ion Implantation Process of Semiconductor Operations
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Park Dong-Uk
Zoh Kyung-Ehi
Kim So-Yeon
Lee Seung-Hee
Jeong Eun-Kyo
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Abstract
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Objectives: The aims of this study are to investigate how X-rays are emitted to surrounding parts during the ion implantation process, to analyze these emissions in relation to the properties of the ion implanter equipment, and to estimate the resulting exposure dose. Eight ion implanters equipped with high-voltage electrical systems were selected for this study.
Methods: We monitored X-ray emissions at three locations outside of the ion implanters: the accelerator equipped with a high-voltage energy generator, the impurity ion source, and the beam line. We used a Personal Portable Dose Rate and Survey Meter to monitor real-time X-ray levels. The SX-2R probe, an X-ray Features probe designed for use with the Radiagem™ meter, was also utilized to monitor lower ranges of X-ray emissions. The counts per second (CPS) measured by the meter were estimated and then converted to a radiation dose (μSv/hr) based on a validated calibration graph between CPS and μGy/hr.
Results: X-rays from seven ion implanters were consistently detected in high-voltage accelerator gaps, regardless of their proximity. X-rays specifically emanated from three ion implanters situated in the ion box gap and were also found in the beam lines of two ion implanters. The intensity of these X-rays did not show a clear pattern relative to the devices' age and electric properties, and notably, it decreased as the distance from the device increased.
Conclusions: In conclusion, every gap, in which three components of the ion implanter devices were divided, was found to be insufficiently shielded against X-ray emissions, even though the exposure levels were not estimated to be higher than the threshold.
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KEYWORD
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ion implanter, ion implantation process, X-ray
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