Typical High voltage variation due to line voltage functuations are generating l
ID: 2075188 • Letter: T
Question
Typical High voltage variation due to line voltage functuations are generating less than 0.005 % 10% line voltage changes. Radiation detection is a a scintillation crystal of sodium iodide doped with 0.1% (coeight) thallium - NaI. rightarrow These large crystals in gamma cameras are easily damaged by thermal or physical shock. Changes in temperature of system will swift the spectrum along horizontal axis. Crystals are hygroscopic means they are easily damaged when opposed to moisture in air (Humid cuvironced) Resolution will decrease by dirt in counter gas Background radition has to be subtracted from the main data. Background substraction very important.Explanation / Answer
(a) typical high voltage variation due to line voltage fluctuation are generally less than 0.005% per 10% live voltage changes.
(2) radiation detector id a scintillation crystal of sodium iodide doped with 0.1% (weight) thallium- NaI.
=> these large crystals in gamma camera are easily damaged by thermal or physical shock.
(3) changes in temperature of system will shift thespectrum along horizontal axis.
(4) crystals are hygroscopic means they are easily damaged when exposed to moisture in air (humid environment).
(5) resolution will decrease by dirt in counter gas.
(6) background radiation has to be substracted from the main data. background substaction is very important.
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