CALCULATION OF THE PASSAGE OF FAST NEUTRONS THROUGH CYLINDRICAL CHANNELS INA BIOLOGICAL SHIELD (in Russian)
The passage of neutrons across a void and the resulting attenuntion are analyzed, and the equation for fast neutron passage throagh a cylindrical void is reduced to I = (I/sub 0//sup pi //sup /sup ss2/ 2 pi H/sup 2/) (where I is the neutron flux from a cylindrical channel with sigma radius and H length, and I/ sub 0/ is the isotropic plane source intensity). Hence, the passage of the neutrons through a cylindrical void in shielding is determined by geometric beam collimation by the channel walls. A rectifying multiplier beta , equal to 10, is required in the case where the source dimension is larger than the channel diameter and fast neutrons may enter the channel by diffusing through the source- to-channel shielding instead of directly from the source. The age approximation is used for determining the neutron distribution in the media surrounding the channel at distances not exceeding approximately - 2 lambda . A solution is given ior an infinite plane layer of H-thick shielding attenuated by a single sigma -radius, H-long cylindrical channel in a fast E/sup 0/ neutron flux of I/ sub 0/n/cm/sup 2//sec. (R.V.J.)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-15-028433
- OSTI ID:
- 4843310
- Journal Information:
- Atomnaya Energ., Journal Name: Atomnaya Energ. Vol. Vol: 10
- Country of Publication:
- Country unknown/Code not available
- Language:
- Russian
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