High pressure melting curve of tin measured using an internal resistive heating technique to 45GPaThermal conductivity measurements of 6H SiC crystals were done in the 300-500 K range by means of radiation thermometry. Both p -and n -type crystals with carrier concentrations in the 8 X 10 15 to 10 20 cm -3 range were used. For the purest samples it was found that the thermal conductivity normal to the c axis is proportional to T-149, the room-temperature value being 3.87 WI cm deg. It was also found that the thermal conductivity parallel to the c axis is about 30% lower than that normal to the c axis. Electrical data in the 100-1000 K range are also presented.

A very pure diamond with contacts of graphite has a linear current-voltage characteristic when subjected to irradiation. The resistivity is inversely proportional to the dose rate and the sensitivity is extremely high for gamma- and X-rays and electron beams. It is concluded that diamond resistors are suitable for clinical radiation dosimetry. This conclusion is also based on earlier work in which diamonds were used as pinpoint counters.

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