Ratio of aerosol and gases of radioactive chlorine and particle size distribution of aerosol formed by high-energy proton irradiation.
To estimate internal doses due to the inhalation of radionuclides produced by the nuclear spallation of the air nuclei in high-energy proton accelerator facilities, the physicochemical properties of radionuclides are very important. Thus, the ratio of aerosol and gases of 38Cl and 39Cl formed by irradiating argon gas-added air with a 48 MeV proton beam has been measured. Radionuclides of 38Cl and 39Cl exist as aerosol, acid gas and non-acid gas. The percentages of activity of 38Cl and 39Cl aerosols are about 80%. The number size distributions of non-radioactive aerosol were characterised by two peaks with diameters of 10-20 nm and larger than 20 nm. As a result predicted by a simple surface model, it was found that the activity size distribution of 38Cl aerosols can be regarded as that having a single peak at 120 nm.
Yokoyama
S
S
Japan Atomic Energy Agency, Tokai-mura, Naka-gun, Ibaraki 319-1195, Japan. yokoyama.sumi@jaea.go.jp
Sato
K
K
Manabe
K
K
Noguchi
H
H
Kaneko
H
H
Oki
Y
Y
Iida
T
T
Tanaka
Su
S
D000336:Aerosols / Q000737:chemistry* / Q000528:radiation effects*; D000396:Air Pollutants, Radioactive / Q000737:chemistry / Q000528:radiation effects; D002713:Chlorine / Q000737:chemistry* / Q000528:radiation effects*; D003198:Computer Simulation; D004735:Energy Transfer; D005740:Gases / Q000737:chemistry / Q000528:radiation effects; D008956:Models, Chemical; D010316:Particle Size; D011522:Protons; D011868:Radioisotopes / Q000737:chemistry* / Q000528:radiation effects*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
D000336:Aerosols; D000396:Air Pollutants, Radioactive; D005740:Gases; D011522:Protons; D011868:Radioisotopes; D002713:Chlorine