Postal intercomparison of absorbed dose for high energy x rays with thermoluminescence dosimeters
- 1. Joint Center for Radiation Therapy and Department of Radiation Therapy, Harvard Medical School, Boston, Massachusetts 02115
Description
This study concerns the accuracy and precision of the IAEA/WHO LiF TLD system used in intercomparison by mail of absorbed doses from 60Co γ-radiation and 4--25 MV x rays. The system employs 160 mg LiF powder in polystyrene capsules, which are placed at 5 or 7 cm depth in water and irradiated to doses close to 200 rad (2.00 Gy). The dosimeters are mailed to the IAEA Dosimetry Laboratory and read out under conditions to minimize variations in instrument sensitivity. The precision of the readout technique, using 3 capsules per irradiation and the readout of 5 aliquots per capsule, is characterized by 0.2% standard deviation of the resulting mean. Since random errors during the irradiation are added, the detectable systematic discrepancy in dose delivery, at the 95% confidence level, is +- 2% for 60Co γ and +- 3% for high-energy x rays
Additional details
Publishing Information
- Journal Title
- Med. Phys.
- Journal Volume
- 7
- Journal Issue
- 5
- Series
- Med. Phys.
- Journal Page Range
- 560-565
- ISSN
- 0094-2405
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 12582399
- Subject category
- S46: INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY;
- Descriptors DEI
- ACCURACY; COBALT 60; COMPARATIVE EVALUATIONS; GAMMA DOSIMETRY; RADIATION DOSES; THERMOLUMINESCENT DOSEMETERS; X-RAY DOSIMETRY
- Descriptors DEC
- BETA DECAY RADIOISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; COBALT ISOTOPES; DOSEMETERS; DOSIMETRY; INTERMEDIATE MASS NUCLEI; INTERNAL CONVERSION RADIOISOTO; ISOMERIC TRANSITION ISOTOPES; ISOTOPES; LUMINESCENT DOSEMETERS; MEASURING INSTRUMENTS; MINUTES LIVING RADIOISOTOPES; NUCLEI; ODD-ODD NUCLEI; RADIOISOTOPES; YEARS LIVING RADIOISOTOPES