Biological and clinical dosimetry. Comprehensive eighteen-year report, July 1, 1964-June 30, 1982

Technical Report · Sun Aug 01 04:00:00 EDT 1982

OSTI ID:6569684

Laughlin, J S; Zeitz, L

The objectives are to develop and apply primary and secondary dosimetric systems for measurements in the complex radiation fields currently in use for radiobiological research and advanced radiation oncology. The concept of local absorbed dose calorimetry continues to be applied and further developed using tissue equivalent and other materials. Aspects of a simplified approach to calorimetry with thermistors used as non-isolated-sensors in polystyrene are described. This approach also has the potential of giving accurate absolute absorbed dose measurements in situations where the irradiation time can be limited to about 20 minutes. A non-isolated-sensor calorimeter has also been constructed of A-150 tissue equivalent (TE) plastic. Comparison of the absorbed dose measurements with these two calorimeters, after correction for the known mass energy absorption coefficients, gives a direct determination of the thermal defect of A-150 plastic at different levels of free O/sub 2/ content in the material. This will permit a study of various approaches to excluding oxygen. This type of calorimeter is presently also being constructed with solid-water-equivalent plastic, i.e., the material designated WT/SRI by Constantinou. Our previously successful isolated sensor calorimeters are still in operation. With the availability of both isolated and non-isolated absorbed dose calorimeters, of our parallel plate ionization chambers in similar material and geometry, and of specific commercial ion chambers, we are in a unique position not only to compare all of these systems but to examine critically basic assumptions in absorbed dose concepts and the correction factors used in different methodologies.

• Research Organization: Memorial Sloan-Kettering Cancer Center, New York (USA)
• DOE Contract Number: AC02-76EV03522
• OSTI ID: 6569684
• Report Number(s): DOE/EV/03522-25; ON: DE82021625
• Country of Publication: United States
• Language: English

Related Subjects

61 RADIATION PROTECTION AND DOSIMETRY
655003* -- Medical Physics-- Dosimetry
BEAMS
CALORIMETRIC DOSEMETERS
CAMERAS
DOSEMETERS
DOSIMETRY
GAMMA CAMERAS
ION BEAMS
LUMINESCENT DOSEMETERS
MEASURING INSTRUMENTS
MOCKUP
NEUTRON BEAMS
NEUTRON DOSIMETRY
NUCLEON BEAMS
PARTICLE BEAMS
PHANTOMS
PHOTON BEAMS
RADIATION DETECTORS
RESEARCH PROGRAMS
SCINTILLATION COUNTERS
SOLID SCINTILLATION DETECTORS
STRUCTURAL MODELS
THERMOLUMINESCENT DOSEMETERS
TISSUE-EQUIVALENT DETECTORS