AMOS – An effective tool for adjoint Monte Carlo photon transport

Gabler, Dorothea; Henniger, J.; Reichelt, U.

doi:10.1016/j.nimb.2006.07.005

Cited by 9 publications

(6 citation statements)

References 11 publications

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“…The PHITS adjoint function follows the formalism outlined by Hoogenboom [3,4] and Gabler et al [5]. The adjoint Boltzmann transport equation is: (12) where superscript pluses and diacritic tildes denote adjoint quantities and operators, respectively.…”

Section: Adjoint Monte Carlo Formalismmentioning

confidence: 99%

“…As it is possible for P + s to be greater than one, pseudo-photon weights can become large and cause high variances in calculation results [5]. This risk should be monitored in adjoint calculation results.…”

Section: Photoelectric Effectmentioning

confidence: 99%

“…The developments are based on the point energy function [5], where pseudo-photons are forced to scatter to discrete energies. This will allow the incorporation of pair production interactions [4].…”

Section: Conclusion and Future Developmentsmentioning

confidence: 99%

“…The point energy function will also allow calculations for photon sources with discrete energies (e.g. line sources, such as radioactive decay gamma rays) [5]. Currently such calculations are not possible in the PHITS adjoint mode, as pseudo-photon histories are unlikely to cross the adjoint tally region with the requisite discrete energies to contribute to the calculation result.…”

Section: Conclusion and Future Developmentsmentioning

confidence: 99%

“…Continuous energy representation is also important for accurately calculating radiation protection quantities, such as ambient dose equivalent (H * (10)). However, there have only been a few implementations of adjoint Monte Carlo for photons with continuous energy representation in popular transport codes [5,6]. This paper outlines the addition of a continuous energy photon adjoint function to the Particle and Heavy Ion Transport code System (PHITS) [7].…”

Section: Introductionmentioning

confidence: 99%

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Continuous energy adjoint transport for photons in PHITS

2017

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Abstract. Adjoint Monte Carlo can be an efficient algorithm for solving photon transport problems where the size of the tally is relatively small compared to the source. Such problems are typical in environmental radioactivity calculations, where natural or fallout radionuclides spread over a large area contribute to the air dose rate at a particular location. Moreover photon transport with continuous energy representation is vital for accurately calculating radiation protection quantities. Here we describe the incorporation of an adjoint Monte Carlo capability for continuous energy photon transport into the Particle and Heavy Ion Transport code System (PHITS). An adjoint cross section library for photon interactions was developed based on the JENDL-4.0 library, by adding cross sections for adjoint incoherent scattering and pair production. PHITS reads in the library and implements the adjoint transport algorithm by Hoogenboom. Adjoint pseudo-photons are spawned within the forward tally volume and transported through space. Currently pseudo-photons can undergo coherent and incoherent scattering within the PHITS adjoint function. Photoelectric absorption is treated implicitly. The calculation result is recovered from the pseudo-photon flux calculated over the true source volume. A new adjoint tally function facilitates this conversion. This paper gives an overview of the new function and discusses potential future developments.

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Section: Adjoint Monte Carlo Formalismmentioning

confidence: 99%

Section: Photoelectric Effectmentioning

confidence: 99%