**9. References**

550 Advances in Cancer Therapy

Legend: 6. 1-1/2"x3-1/2" Oak frame support, 7. Lexan beam spoiler, 8. Support for block tray with galvanized metal support, 9. Galvanized metal lock, 10. Crank, 11. Bearing location & cap (2 bearings/crank), 12. Ball bearing track for horizontal block adjustment, 13. ¼" block tray, 14. 7/16"

thread rod, 15. ¼" channel for rod adjustment system

Fig. A-4 AP/PA Beam Spoiler and Blocking Support Side View

Bentel, G. (1992). *Radiation Therapy Planning* (4th ed.). New York, NY: Macmillan.


**1. Introduction** 

and the intensity of the radiation.

organs, and to verify machine output for QA purposes.

**2. Radio-Photoluminescence Glass Dosimeter (RPLGD)** 

**Radio-Photoluminescence Glass Dosimeter (RPLGD)** 

David Y.C. Huang1 and Shih-Ming Hsu2 *1Memorial Sloan-Kettering Cancer Center* 

Radiation is a type of the energy transport. It produces ionization, scintillation, and luminescence when radiation interacts with matter. By detecting these phenomena from the response of the dosimeter after exposure, one can acquire an understanding on the types

Solid state dosimeters can be divided into two categories, active dosimeters and passive dosimeters. When radiation interacts with medium inside the dosimeter, the active dosimeter transfers radiation intensity into the pulse of electric signals. Based on those signals, users can determine the types and the intensity of the radiation. As for passive dosimeters, radiation interaction is detected through certain physical processes after radiation interacts with medium in the dosimeter. From the physical processes, users can also determine the types and the intensity of the radiation. Active dosimeters are used for dose measurements in areas with unknown radiation level to gather the radiation information immediately. Therefore, the proper radiation protection actions can be initialized. The common active dosimeters in the market are gas-filled counters, scintillation counters, and semi-conductor detectors…etc. On the other hands, passive dosimeters are often used as periodic radiation monitor for people work in the radiation environment to monitor the cumulated dose and the types of radiation. They can be used as personal dose measurement, long-term environmental radiation dose monitor…etc. The film badge, Thermoluminescence Dosimeter (TLD), Optically Stimulated Luminescence Dosimeter (OSLD), and Radio-photoluminescence Glass Dosimeter (RPLGD) are commonly used passive dosimeters. In clinics, many different kinds of dosimeters are applied in the procedures to verify dose delivery accuracy, to obtain dose to critical areas or

For TLD, OSLD, and RPLGD, when radiation interacts with the medium in the dosimeters, part of the absorbed energy are first stored in a metastable energy state of the medium. Then some of this energy can be recovered later as visible light after proper physical process, such as heating.

OSLD is made of the same luminescent material as one used in TLD. The only differences are different excitation source and different readout technique used. However, RPLGD uses

*2China Medical University* 

*1USA* 

*2Taiwan (ROC)* 

Van Dyk, J. (2000). Magna-field irradiation: physical considerations. *International Journal of Radiation Oncology, Biology and Physics, 43*, 1913-1918. **25**
