Biomaterial Database

Correlation between temperature and dose rate dependence of semiconductor response; influence of accumulated dose. 1990

J Van Dam, and G Leunens, and A Dutreix

Department of Radiotherapy, University Hospital St. Rafaël, Leuven, Belgium.

The temperature and dose per pulse dependence of 20 Therados semiconductor detectors have been investigated. The rise in relative response observed when increasing temperature from 20 degree C to 32 degree C ranges between 1.00 and 1.07, that observed when increasing dose per pulse from 9.8 x 10(-6) to 6.5 x 10(-4) Gy/pulse between 1.01 and 1.11. The diodes with the most pronounced dose per pulse dependence have also the most pronounced temperature dependence. Accumulated dose has been found to increase both temperature and dose per pulse dependence until a level off dose (less than 4 kGy for one of the diodes) is reached. However, no level off has been observed concerning sensitivity decrease with dose: after an accumulated dose of 29 kGy a sensitivity decrease of 65% was still observed when giving another 25 kGy to one of the diodes.

UI	MeSH Term	Description	Entries
D008961	Models, Structural	A representation, generally small in scale, to show the structure, construction, or appearance of something. (From Random House Unabridged Dictionary, 2d ed)	Model, Structural,Structural Model,Structural Models
D011829	Radiation Dosage	The amount of radiation energy that is deposited in a unit mass of material, such as tissues of plants or animal. In RADIOTHERAPY, radiation dosage is expressed in gray units (Gy). In RADIOLOGIC HEALTH, the dosage is expressed by the product of absorbed dose (Gy) and quality factor (a function of linear energy transfer), and is called radiation dose equivalent in sievert units (Sv).	Sievert Units,Dosage, Radiation,Gray Units,Gy Radiation,Sv Radiation Dose Equivalent,Dosages, Radiation,Radiation Dosages,Units, Gray,Units, Sievert
D011879	Radiotherapy Dosage	The total amount of radiation absorbed by tissues as a result of radiotherapy.	Dosage, Radiotherapy,Dosages, Radiotherapy,Radiotherapy Dosages
D002138	Calibration	Determination, by measurement or comparison with a standard, of the correct value of each scale reading on a meter or other measuring instrument; or determination of the settings of a control device that correspond to particular values of voltage, current, frequency or other output.	Calibrations
D005373	Film Dosimetry	Use of a device (film badge) for measuring exposure of individuals to radiation. It is usually made of metal, plastic, or paper and loaded with one or more pieces of x-ray film.	Film Badge Dosimetry,Film Badge,Badge Dosimetries, Film,Badge Dosimetry, Film,Badge, Film,Badges, Film,Dosimetries, Film,Dosimetries, Film Badge,Dosimetry, Film,Dosimetry, Film Badge,Film Badge Dosimetries,Film Badges,Film Dosimetries
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D012666	Semiconductors	Materials that have a limited and usually variable electrical conductivity. They are particularly useful for the production of solid-state electronic devices.	Semiconductor
D012881	Skin Temperature	The TEMPERATURE at the outer surface of the body.	Skin Temperatures,Temperature, Skin,Temperatures, Skin
D013696	Temperature	The property of objects that determines the direction of heat flow when they are placed in direct thermal contact. The temperature is the energy of microscopic motions (vibrational and translational) of the particles of atoms.	Temperatures
D013997	Time Factors	Elements of limited time intervals, contributing to particular results or situations.	Time Series,Factor, Time,Time Factor