Like gas counters, liquid scintillation counters require shielding and anticoincidence counters.
2.
To reduce gamma rays, an anticoincidence shield can be used " see Compton suppression ".
3.
An anticoincidence detector is the instrument's first line of defense, screening out the more abundant background of cosmic rays.
4.
The SPI "'ACS "'( AntiCoincidence Shield ) consists of a mask shield and a detector shield.
5.
An anticoincidence shield of some kind is needed so that charged particles entering the device from outside are not confused with electron-positron pairs generated in the conversion foils.
6.
Now I know you know this refers to gas proportional counters and liquid scintillation counters, but just before this, at the end of the third paragraph, you mentioned anticoincidence counters.
7.
In addition, anticoincidence detectors are used; these record events outside the counter, and any event recorded simultaneously both inside and outside the counter is regarded as an extraneous event and ignored.
8.
A typical configuration might have a NaI scintillator almost completely surrounded by a thick CsI anticoincidence shield, with a hole or holes to allow the desired gamma rays to enter from the cosmic source under study.
9.
E-ASTROGAM is made of 56 Silicon planes, about 1 m ^ 2 each, which record Compton interactions and pair production events induced by cosmic photons, by an anticoincidence detector and by a calorimeter.
10.
Once both the electron and positron were created, if one of these particles was still moving down throughout the telescope and a signal from the anticoincidence scintillator wasn t fired, the particle was imaged and its energy level recorded.
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