Monte Carlo-based revised values of dose rate constants at discrete photon energies
Absorbed dose rate to water at 0.2 cm and 1 cm due to a point isotropic photon source as a function of photon energy is calculated using the EDKnrc user-code of the EGSnrc Monte Carlo system. This code system utilized widely used XCOM photon cross-section dataset for the calculation of absorbed dose...
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| Format: | Article |
| Language: | English |
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Wolters Kluwer Medknow Publications
2014-01-01
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| Series: | Journal of Medical Physics |
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| Online Access: | http://www.jmp.org.in/article.asp?issn=0971-6203;year=2014;volume=39;issue=1;spage=4;epage=9;aulast=Selvam |
| _version_ | 1828747395240820736 |
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| author | T Palani Selvam Vandana Shrivastava Ghanashyam Chourasiya D. Appala Raju Babu |
| author_facet | T Palani Selvam Vandana Shrivastava Ghanashyam Chourasiya D. Appala Raju Babu |
| author_sort | T Palani Selvam |
| collection | DOAJ |
| description | Absorbed dose rate to water at 0.2 cm and 1 cm due to a point isotropic photon source as a function of photon energy is calculated using the EDKnrc user-code of the EGSnrc Monte Carlo system. This code system utilized widely used XCOM photon cross-section dataset for the calculation of absorbed dose to water. Using the above dose rates, dose rate constants are calculated. Air-kerma strength S k needed for deriving dose rate constant is based on the mass-energy absorption coefficient compilations of Hubbell and Seltzer published in the year 1995. A comparison of absorbed dose rates in water at the above distances to the published values reflects the differences in photon cross-section dataset in the low-energy region (difference is up to 2% in dose rate values at 1 cm in the energy range 30-50 keV and up to 4% at 0.2 cm at 30 keV). A maximum difference of about 8% is observed in the dose rate value at 0.2 cm at 1.75 MeV when compared to the published value. S k calculations based on the compilation of Hubbell and Seltzer show a difference of up to 2.5% in the low-energy region (20-50 keV) when compared to the published values. The deviations observed in the values of dose rate and S k affect the values of dose rate constants up to 3%. |
| first_indexed | 2024-04-14T04:42:15Z |
| format | Article |
| id | doaj.art-d08344000e0b432fa5004f1993953dba |
| institution | Directory Open Access Journal |
| issn | 0971-6203 1998-3913 |
| language | English |
| last_indexed | 2024-04-14T04:42:15Z |
| publishDate | 2014-01-01 |
| publisher | Wolters Kluwer Medknow Publications |
| record_format | Article |
| series | Journal of Medical Physics |
| spelling | doaj.art-d08344000e0b432fa5004f1993953dba2022-12-22T02:11:38ZengWolters Kluwer Medknow PublicationsJournal of Medical Physics0971-62031998-39132014-01-013914910.4103/0971-6203.125473Monte Carlo-based revised values of dose rate constants at discrete photon energiesT Palani SelvamVandana ShrivastavaGhanashyam ChourasiyaD. Appala Raju BabuAbsorbed dose rate to water at 0.2 cm and 1 cm due to a point isotropic photon source as a function of photon energy is calculated using the EDKnrc user-code of the EGSnrc Monte Carlo system. This code system utilized widely used XCOM photon cross-section dataset for the calculation of absorbed dose to water. Using the above dose rates, dose rate constants are calculated. Air-kerma strength S k needed for deriving dose rate constant is based on the mass-energy absorption coefficient compilations of Hubbell and Seltzer published in the year 1995. A comparison of absorbed dose rates in water at the above distances to the published values reflects the differences in photon cross-section dataset in the low-energy region (difference is up to 2% in dose rate values at 1 cm in the energy range 30-50 keV and up to 4% at 0.2 cm at 30 keV). A maximum difference of about 8% is observed in the dose rate value at 0.2 cm at 1.75 MeV when compared to the published value. S k calculations based on the compilation of Hubbell and Seltzer show a difference of up to 2.5% in the low-energy region (20-50 keV) when compared to the published values. The deviations observed in the values of dose rate and S k affect the values of dose rate constants up to 3%.http://www.jmp.org.in/article.asp?issn=0971-6203;year=2014;volume=39;issue=1;spage=4;epage=9;aulast=SelvamAbsorbed dose rateair-kerma strengthbrachytherapydose rate constantTG-43 |
| spellingShingle | T Palani Selvam Vandana Shrivastava Ghanashyam Chourasiya D. Appala Raju Babu Monte Carlo-based revised values of dose rate constants at discrete photon energies Journal of Medical Physics Absorbed dose rate air-kerma strength brachytherapy dose rate constant TG-43 |
| title | Monte Carlo-based revised values of dose rate constants at discrete photon energies |
| title_full | Monte Carlo-based revised values of dose rate constants at discrete photon energies |
| title_fullStr | Monte Carlo-based revised values of dose rate constants at discrete photon energies |
| title_full_unstemmed | Monte Carlo-based revised values of dose rate constants at discrete photon energies |
| title_short | Monte Carlo-based revised values of dose rate constants at discrete photon energies |
| title_sort | monte carlo based revised values of dose rate constants at discrete photon energies |
| topic | Absorbed dose rate air-kerma strength brachytherapy dose rate constant TG-43 |
| url | http://www.jmp.org.in/article.asp?issn=0971-6203;year=2014;volume=39;issue=1;spage=4;epage=9;aulast=Selvam |
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