PubMed · 4514485
The source did not provide an abstract. Follow the original record for more information.
Explore connections, maps & timelines
W Finger. 1972-08-25. [Material studies on new model materials].. https://pubmed.ncbi.nlm.nih.gov/4514485/
Cite the original work for its findings. Save a collection to share your selection of sources.
KEEP EXPLORING
Two methods for radon emanation factor determination were performed and compared regarding their measuring accuracy: (a) by hermetically closing the sample in an airtight container and measuring the induced radon activity, and (b) by mixing charcoal and sealing the sample hermetically and after placing the sample in an open vessel with no charcoal addition, measuring each time the 226Ra content using gamma-spectrometry. Measurements of radon emanation factor of cement and pozzolanic additives, i.e. fly ash and phosphogypsum were also performed.
The effects of calcium sulfate concentration in soymilk on the microstructure of tofu and the constitutions of protein in tofu whey were investigated. The firm tofu made with 0.4% CaSO(4).2H(2)O was found to be most uniform and continuous in the microstructure. This tofu gave the maximal tofu yield, maximal solid and protein recoveries, and the best water retention ability. The results of gel electrophoresis and the ratio of amino nitrogen to total organic nitrogen indicated that the low molecular weight proteins in tofu whey were at their lowest when the tofu was made with 0.4% CaSO(4).2H(2)O. The SEM observations suggested that the tofu made with 0.4% CaSO(4).2H(2)O has the most uniform and homogeneous microstructure and, consequently, can most efficiently retain soybean proteins and water in the tofu gel.
We report new effective linear attenuation coefficients (mueff) for refined gypsum for Co-60 and 18 MV x-rays. 6 MV and 10 MV mueff agree with published data. For a 100 cm2 field size (FS), tissue defect x = 1.35 cm, target depth d = 1.65 cm beneath the tissue defect x, mueff is 0.123 cm(-1) (Co-60) and 0.0934 cm(-1) (6 MV). For 100 cm2, x = 1.35 cm, and d = 5.65 cm beneath x, mueff is 0.072 cm(-1) (10 MV), and 0.0614 cm(-1) (18 MV). Ford, mueff decreases about 10% from 25 to 400 cm2. For a given FS, mueff decreases with d by 3%-5% for Co-60, and 3% for 6 MV, 10 MV and 18 MV, but depends on (d - x). For d, when x is large (8 cm), depending on energy and FS, mueff is 2%-4% less than when x is small (2 cm). These data were used in a treatment-planning computer to design compensator filters for a step phantom. Compensation was to within 10% in the compensation plane (CP). Above and below CP, computer-calculated ratios of doses with and without filters were 0.75-1.13. Chamber dose ratios with and without filters were 0.75-1.12.