A[cedilla] Implement new primary circuit boron-10
concentration monitoring points
BNCT treatment produces radiation inside a tumor using boron-10
and thermal neutrons.
The Brightsen Model predicts that the large cross section of Boron-10
(as opposed to the small cross section of Boron-11) results from the presence of a stable and independent nucleon cluster structure [PNP], which coexists with two [NP] and one [NPN] clusters that maintain very small cross sections.
With the use of Boron-10
coated collimators one can reduce this component considerably.
Collisions of carbon, oxygen, and nitrogen nuclei with high-speed protons would produce twice the measured ratio of boron to beryllium and only half the ratio of the isotope boron-11 to boron-10, a sibling with one fewer neutron.
Federman of the University of Toledo in Ohio and his colleagues, including Lambert, used the Goddard spectrograph to measure the relative abundances of boron-10 and boron-11 along the line of sight to three stars in the nearby interstellar medium.
The researchers conclude that the interstellar medium in Earth's neighborhood contains four times as much boron-11 as boron-10.
The successful treatment of cancer by BNCT, however, requires selective concentration of boron-10
within malignant tumors, and the major obstacle to this therapy in the past has been the difficulty in targeting sufficient quantities of boron-containing drug to the cancerous cells.
In order to guarantee efficient neutron detectors at the future ESS facility, and avoid dependence on helium-3, whose production is extremely limited, and consequently very expensive, the Neutron Detector Group at ESS and scientists at the Thin Film Physics Division at Linkoping University launched an extensive R&D work aimed at enabling the use of enriched thin films of boron-10
carbide for ESS' detector systems, instead of using helium-3.
The collisions would produce twice the measured ratio of boron to beryllium and only half the observed abundance of boron-11 to boron-10
Kahl and his colleagues at the University of California, San Francisco, deeloped the molecular "package bomb" as a 20-sided solid with one atom of boron-10
-- a neutron-absorbing isotope of boron--at each of the molecule's 12 corners.