Evaluating environmental radiations of the tomotherapy facility by optimizing full factorial design of the TLD technique

Zhangmin Shen; Ying-Hsiang Chou; Cheng-Chang Lu; Ren-Jing Huang; Ching-Hsiu Ke; Lung-Kwang Pan; Chien-Yi Chen

doi:10.3233/THC-THC228044

Evaluating environmental radiations of the tomotherapy facility by optimizing full factorial design of the TLD technique

Technol Health Care. 2022;30(S1):481-491. doi: 10.3233/THC-THC228044.

Authors

Zhangmin Shen¹, Ying-Hsiang Chou^{1

2

3}, Cheng-Chang Lu^{1

2}, Ren-Jing Huang^{1

2}, Ching-Hsiu Ke^{4

5}, Lung-Kwang Pan⁴, Chien-Yi Chen^{1

2}

Affiliations

¹ Department of Medical Imaging and Radiological Sciences, Chung Shan Medical University, Taichung, Taiwan.
² Department of Radiation Oncology, Chung Shan Medical University Hospital, Chung Shan Medical University, Taichung, Taiwan.
³ School of Medicine, Chung Shan Medical University, Taichung, Taiwan.
⁴ Department of Medical Imaging and Radiological Science, Central Taiwan University of Science and Technology, Takun, Taichung, Taiwan.
⁵ Department of Optometry, Central Taiwan University of Science and Technology, Takun, Taichung, Taiwan.

Abstract

Background: In the last 40 years, the number of deaths due to cancer has been the highest in TaiwanOBJECTIVE: To optimize the readout system of the thermoluminescent dosimeter (TLD)-100H, the radiation rates among the Tomotherapy (TOMO) facility of the Department of Radiology Oncology of Chung Shan Medical University Hospital (CSMUH) were calculated with a 32 full factorial design (FFD).

Methods: A ten-month survey of the facility was employed using the sensitive and accurate TLD method. The TLD system was optimized for maximum temperature, heat rate, and preheat temperature of Harshaw 3500 reader. Eight analyzed groups with different factors were tested.

Results: The TOMO facility had significantly different radiation rates. The farther away from the gantry head, environmental radiation rates. The half value layer (HVL) was also determined. These results were compared with published. No significant contributions of environmental gamma radiations were detected except in the treatment room.

Conclusions: Those were far below the occupational doses recommended by ICRP 60.

Keywords: Full factorial design; environmental radiations; half value layer (HVL); thermoluminescence dosimeter (TLD); tomotherapy facility.

MeSH terms

Gamma Rays
Humans
Radiation Dosage
Radiation Dosimeters*
Radiotherapy, Intensity-Modulated*
Thermoluminescent Dosimetry / methods