title: Comparison of fluence-to-dose conversion coefficients for deuterons, tritons and helions.
abstract: Secondary radiation in aircraft and spacecraft includes deuterons, tritons and helions. Two sets of fluence-to-effective dose conversion coefficients for isotropic exposure to these particles were compared: one used the particle and heavy ion transport code system (PHITS) radiation transport code coupled with the International Commission on Radiological Protection (ICRP) reference phantoms (PHITS-ICRP) and the other the Monte Carlo N-Particle eXtended (MCNPX) radiation transport code coupled with modified BodyBuilder™ phantoms (MCNPX-BB). Also, two sets of fluence-to-effective dose equivalent conversion coefficients calculated using the PHITS-ICRP combination were compared: one used quality factors based on linear energy transfer; the other used quality factors based on lineal energy (y). Finally, PHITS-ICRP effective dose coefficients were compared with PHITS-ICRP effective dose equivalent coefficients. The PHITS-ICRP and MCNPX-BB effective dose coefficients were similar, except at high energies, where MCNPX-BB coefficients were higher. For helions, at most energies effective dose coefficients were much greater than effective dose equivalent coefficients. For deuterons and tritons, coefficients were similar when their radiation weighting factor was set to 2.
authors.affiliation: Federal Aviation Administration, Civil Aerospace Medical Institute, 6500 S. MacArthur Blvd., Oklahoma City, OK 73169, USA. kyle.copeland@faa.gov
authors.forename: Kyle
authors.initials: K
authors.lastname: Copeland
authors.forename: Wallace
authors.initials: W
authors.lastname: Friedberg
authors.forename: Tatsuhiko
authors.initials: T
authors.lastname: Sato
authors.forename: Koji
authors.initials: K
authors.lastname: Niita
mesh_terms: D000328:Adult; D000512:Alpha Particles; D000886:Anthropometry; D001822:Body Burden; D003198:Computer Simulation; D003903:Deuterium / Q000493:pharmacokinetics*; D005260:Female; D020450:Heavy Ions; D006801:Humans; D008297:Male; D009010:Monte Carlo Method; D019047:Phantoms, Imaging; D011092:Polyethylene Glycols / Q000493:pharmacokinetics*; D011829:Radiation Dosage; D011834:Radiation Monitoring; D011835:Radiation Protection; D014018:Tissue Distribution
chemical_list: D011092:Polyethylene Glycols; D003903:Deuterium