Evidence for using Monte Carlo calculated wall attenuation and scatter correction factors for three styles of graphite-walled ion chamber

Physics in Medicine and Biology

Volumn 49, Issue 12, 2004, Pages 2491-2501

  McCaffrey, John P ^b   Mainegra Hing, E ^b   Kawrakow, I ^b   Shortt, K R ^b   Rogers, D W O ^a  

^a CARLETON UNIVERSITY   (Canada)

^b NATIONAL RESEARCH COUNCIL CANADA   (Canada)

Author keywords

[No Author keywords available]

Indexed keywords

ATTENUATION; ERROR ANALYSIS; EXTRAPOLATION; GRAPHITE; MONTE CARLO METHODS; PHOTONS;

GRAPHITE-WALLED ION CHAMBERS; PHOTON SCATTERING;

IONIZATION CHAMBERS;

COBALT 60; GRAPHITE; RADIOACTIVE MATERIAL;

AIR; ARTICLE; CALCULATION; CONTROLLED STUDY; IONIZATION CHAMBER; LINEAR SYSTEM; MONTE CARLO METHOD; PHOTON; PRIORITY JOURNAL; RADIATION ATTENUATION; RADIATION MEASUREMENT; RADIATION SCATTERING;

ALGORITHMS; CALIBRATION; COBALT RADIOISOTOPES; EQUIPMENT FAILURE ANALYSIS; GRAPHITE; LINEAR ENERGY TRANSFER; MODELS, STATISTICAL; MONTE CARLO METHOD; PHOTONS; RADIATION DOSAGE; RADIOMETRY; REPRODUCIBILITY OF RESULTS; SCATTERING, RADIATION; SENSITIVITY AND SPECIFICITY;

EID: 3242754428     PISSN: 00319155     EISSN: None     Source Type: Journal    
DOI: 10.1088/0031-9155/49/12/002     Document Type: Article

References (24)

1. 60Co γ Rapport BIPM-99/12
2. Attix F W 1986 Introduction to Radiological Physics and Radiation Dosimetry (New York: Wiley)
3. Bielajew A F 1990a On the technique of extrapolation to obtain wall correction factors for ion chambers irradiated by photon beams Med. Phys. 17 583-7
4. Bielajew A F 1990b An analytic theory of the point-source nonuniformity correction factor for thick-walled ionisation chambers in photon beams Phys. Med. Biol. 35 517-38
5. 60Co beams Phys. Med. Biol. 37 1283-91
6. Borg J, Kawrakow I, Rogers D W O and Seuntjens J 2000 Monte Carlo study of correction factors for Spencer-Attix cavity theory at photon energies at or above 100 keV Med. Phys. 27 1804-13
7. 60Co gamma rays Metrologia 9 139-146
8. Büermann L, Kramer H-M and Csete I 2003 Results supporting calculated wall correction factors for cavity chambers Phys. Med. Biol. 48 3581-91
9. Cormack D V and Johns H E 1954 The measurement of high-energy radiation intensity Radiat. Res. 1 133-57
10. Harris F K 1962 Electrical Measurements (New York: Wiley)
11. Henry W H 1972 unpublished
12. Kawrakow I 2000a Accurate condensed history Monte Carlo simulation of electron transport. I. EGSnrc, the new EGS4 version Med. Phys. 27 485-98
13. Kawrakow I 2000b Accurate condensed history Monte Carlo simulation of electron transport. II. Application to ion chamber response simulations Med. Phys. 27 499-513
14. 60Co beams Phys. Med. Biol. 47 2411-31
15. Moon C and Sparks M 1948 Standards for low values of direct capacitance J. Res. Natl Bur. Stand. Research paper RP1935 497-507
16. 60Co therapy source Med. Phys. 26 2494-502
17. Rogers D W O and Bielajew A F 1990 Wall attenuation and scatter corrections for ion chambers: measurements versus calculations Phys. Med. Biol. 35 1065-78
18. Rogers D W O and Kawrakow I 2003 Monte Carlo calculated correction factors for primary standards of air kerma Med. Phys. 30 521-32
19. Rogers D W O and Treurniet J 1999 Monte Carlo calculated wall and axial non-uniformity corrections for primary standards of air kerma NRC Report PIRS-663 (Ottawa) http://www.irs.inms.nrc.ca/inms/irs/papers/irs_www/irs_www.html
20. Rogers D W O, Faddegon B A, Ding G X, Ma C-M, Wei J and Mackie T R 1995 BEAM: A Monte Carlo code to simulate radiotheraphy treatment units Med. Phys. 22 503-24
21. 60Co Exposure Standard NRC Report PIRS-0052 (Ottawa)
22. Shortt K R, Bielajew A F, Ross C K, Stewart K J, Burke J T and Corsten M J 2002 The effect of wall thickness on the response of a spherical ionization chamber Phys. Med. Biol. 47 1721-31
23. Takata N, Kurosawa T and Koyama Y 2003a Ionization chamber wall correction factors and angular dependences of responses in measuring air kerma for gamma rays BIPM Report CCRI(I)/03-18, 4 pages
24. Takata N, Kurosawa T and N T 2003b Angular dependence of signal currents from cylindrical ionization chambers Radiat. Prot. Dosim. 107 293-6