Determination of the Phantom Scatter Factor (Sp Factor) using a small Block in the Phantom

Yi,  Byong Yong; Hong,  Seok Min; Kim,  Jae Sung; Choi,  Eun Kyung; Chang,  Hyesook; Lee,  Myung Za; Chun,  Ha Chung

J Korean Soc Ther Radiol > Volume 10(1); 1992 > Article

Original Article

Journal of the Korean Society for Therapeutic Radiology 1992;10(1): 121-123.

Determination of the Phantom Scatter Factor (Sp Factor) using a small Block in the Phantom

Byong Yong Yi, Seok Min Hong, Jae Sung Kim, Eun Kyung Choi, Hyesook Chang, Myung Za Lee, Ha Chung Chun

¹Department of Therapeutic Radiology, Asan Medical Center, College of Medicine, University of Ulsan, Seoul, Korea.
²Department of Therapeutic Radiology, Hanyang University Hospital, College of Medicine, University of Hanyang, Seoul, Korea.

ABSTRACT

New measurement method for Sp factors (Phantom Scatter Factors) is presented. The theoretical development of the approach is disscused showing that Sp factors can be obtained from three measurements of ionnization in a blocked, reference field and open field. This method has been tested using 60Co gamma rays. The results were within 1% deviation between the theory and the experiment for the Sp facter. The new method does not need air measurement, and we could determine the Sp p factors with a small piece of block.

Key Words: Scatter Factor, Dosimetry