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Abstract
Multiple door interlock switches in commercial microwave ovens are designed to prevent accidental exposure and injury. We report a) heating rate (°C/sec) measurements in a phantom of the human upper extremity in a 2450 MHz microwave oven having interlock switches deliberately bypassed; b) skin temperature measurements on the upper extremity of a human volunteer similarly exposed; c)perception of warmth and pain experienced by the volunteer during exposure; d) the rrno graphic camera recordings of the volunteer’s skin; and e) finite element modeling of specific absorption rate (SAR) in the volunteer’s hand. Moderately severe pain was experienced at the fingertips after 5 sec of exposure, consistent with the modeled SAR, measured heating rates, and published data on the temperature threshold for pain. We estimate that an additional 9 sec of exposure would be required to produce irreversible injury, consisting of focal thermal injury in the fingertips and possibly the thenar and hypothenar eminences.
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Notes on contributors
J. Oleson
James R. Oleson is currently affiliated with the Department of Radiation Oncology, Health Care International, Beardmore Street, Clydebank G81 4DY, Scotland. Thaddeus V. Samulski, Scott T. Clegg, Shiva Das, and Wendy J. Grant are affiliated with the Department of Radiation Oncology, Duke University Medical Center, Durham, NC 27710.
T. Samulski
James R. Oleson is currently affiliated with the Department of Radiation Oncology, Health Care International, Beardmore Street, Clydebank G81 4DY, Scotland. Thaddeus V. Samulski, Scott T. Clegg, Shiva Das, and Wendy J. Grant are affiliated with the Department of Radiation Oncology, Duke University Medical Center, Durham, NC 27710.
S. Clegg
James R. Oleson is currently affiliated with the Department of Radiation Oncology, Health Care International, Beardmore Street, Clydebank G81 4DY, Scotland. Thaddeus V. Samulski, Scott T. Clegg, Shiva Das, and Wendy J. Grant are affiliated with the Department of Radiation Oncology, Duke University Medical Center, Durham, NC 27710.
S. Das
James R. Oleson is currently affiliated with the Department of Radiation Oncology, Health Care International, Beardmore Street, Clydebank G81 4DY, Scotland. Thaddeus V. Samulski, Scott T. Clegg, Shiva Das, and Wendy J. Grant are affiliated with the Department of Radiation Oncology, Duke University Medical Center, Durham, NC 27710.
W. Grant
James R. Oleson is currently affiliated with the Department of Radiation Oncology, Health Care International, Beardmore Street, Clydebank G81 4DY, Scotland. Thaddeus V. Samulski, Scott T. Clegg, Shiva Das, and Wendy J. Grant are affiliated with the Department of Radiation Oncology, Duke University Medical Center, Durham, NC 27710.