title: 32P measurement and dose conversion factor evaluation of activated human hair by criticality accident.
abstract: In order to conduct dose assessment of victims in criticality accidents, a method of fast neutron capture-activated (32)P measurement of hair in which samples are treated by a chemical and analytical procedure that takes 9 h and measurement is conducted by liquid scintillation counting is presented. To validate this measurement method, hair samples spiked with a (32)P reference source were measured and the results analysed and the optimal sample mass and detection efficiency were determined. To verify the correlation between (32)P-specific activity and absorbed dose for spectra with two neutron mean energies, samples collected from three normal individuals were irradiated at various neutron energies and irradiation times using the MC50 Cyclotron of the Korea Institute of Radiological and Medical Sciences. The (32)P-specific activity trend of the irradiated hair agreed well with the absorbed doses. Based on the results, dose conversion factors, which were 0.67 ± 0.15 and 0.59 ± 0.06 Gy (Bq g(-1))(-1) at neutron mean energies of 2.33 and 5.36 MeV, respectively, were calculated as a guide for medical treatment of criticality accident victims.
authors: National Radiation Emergency Medical Center, Korea Institute of Radiological and Medical Sciences, Seoul, Korea.
authors: Seokwon
authors: S
authors: Yoon
authors: National Radiation Emergency Medical Center, Korea Institute of Radiological and Medical Sciences, Seoul, Korea lovin@kirams.re.kr.
authors: Wi-Ho
authors: WH
authors: Ha
authors: National Radiation Emergency Medical Center, Korea Institute of Radiological and Medical Sciences, Seoul, Korea.
authors: Seyoung
authors: S
authors: Park
authors: National Radiation Emergency Medical Center, Korea Institute of Radiological and Medical Sciences, Seoul, Korea.
authors: Seongwook
authors: S
authors: Shin
authors: National Radiation Emergency Medical Center, Korea Institute of Radiological and Medical Sciences, Seoul, Korea.
authors: Jaeryong
authors: J
authors: Yoo
authors: National Radiation Emergency Medical Center, Korea Institute of Radiological and Medical Sciences, Seoul, Korea.
authors: Sunhoo
authors: S
authors: Park
authors: National Radiation Emergency Medical Center, Korea Institute of Radiological and Medical Sciences, Seoul, Korea.
authors: Seung-Sook
authors: SS
authors: Lee
mesh_terms: D002138:Calibration; D017357:Cyclotrons; D005214:Fast Neutrons; D005260:Female; D006197:Hair; D006801:Humans; D008297:Male; D009502:Neutrons; D019047:Phantoms, Imaging; D010761:Phosphorus Radioisotopes / Q000737:chemistry*; D019904:Polymethyl Methacrylate / Q000737:chemistry; D018788:Radioactive Hazard Release; D011874:Radiometry / Q000295:instrumentation* / Q000379:methods; D015203:Reproducibility of Results; D056910:Republic of Korea; D012588:Scintillation Counting
chemical_list: D010761:Phosphorus Radioisotopes; D019904:Polymethyl Methacrylate