| Budget Amount *help |
¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 2005: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2004: ¥2,900,000 (Direct Cost: ¥2,900,000)
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| Research Abstract |
1.Distribution of Cosmic Ray Ionizing Component with Altitude
I got actual survey data of a 1cm dose equivalent rate of ionizing component of cosmic rays in Mt.Everest and neighboring areas (areas at a low geomagnetic latitude). If the 1cm dose equivalent rate of cosmic-ray ionizing components is shown as H_i (Z) (the unit is nSv/h) at the altitude of Z (the unit is km), it is expressed in approximation as follows :
H_i(Z)=20.3 exp(0.489Z)
2.Distribution of Cosmic Ray Neutron Component with Altitude
I got actual survey data of a 1cm dose equivalent rate of neutron component of cosmic rays in Mt.Everest and neighboring areas (areas at a low geomagnetic latitude). If the 1cm dose equivalent rate of cosmic-ray neutron components is shown as H_n(Z) (the unit is nSv/h) at the altitude of Z (the unit is kim), it is expressed in approximation as follows :
H_n(Z)=4.00 exp(0.616Z)
In addition, in a stone building of highlands race sherpa, it is expressed in approximation as follows :
H_n(Z)=3.11 exp(0.628Z)
3.Change of Earth Gamma Rays
I got actual survey data of a change of a 1cm dose equivalent rate of earth gamma rays in Mt.Everest and neighboring areas (areas between Lukla and Kala Patthar, areas between Lukla and Gokyo Peak). In addition, from energy analysis of gamma rays, I got 1cm dose equivalent rates to U series, Th series and potassium-40. It is enormous actual survey data and it is difficult to introduce it briefly. It is the first valuable actual survey data in the world, and it is necessary to analyze actual survey data in cooperation with mineralogical experts.
4.Future Prospects
Accumulation of actual survey data of earth gamma rays in the Himalayas except Mt.Everest area is expected, and accumulation of actual survey data of cosmic rays in low and high geomagnetic latitude areas is expected.
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