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None Re: how to calculate the detector efficiency? 

Forum: Hits, Digitization and Pileup
Re: None how to calculate the detector efficiency? (T.P.Lee)
Re: None Re: how to calculate the detector efficiency? (Makoto Asai)
Re: None Re: how to calculate the detector efficiency? (T.P.Lee)
Date: 02 Nov, 2002
From: michel maire <michel maire>

User T.P.Lee wrote:

>> I still have some confuse with it. the detector efficiency, in my case
>> ,means the number of events absorbed and divide with the number of
>> events incident on the absorber. This is based from the book by Glenn F.
>> Knoll, Radiation Detection and measurement. So I think I need get the
>> number of events absorbed by the absorber( that is a BGO crystal). but i
>> don't know how to do it.
>> 
>> when one particle enters the BGO crystal, there are some possibility,
>> one is it pass through the crystal, and another is it loses its total
>> energy and is absorbed by the crystal. It appears clearly for me I
>> should count the latter case. but how to know one particle lose its
>> total energy after it enter the BGO?
>> 
>> thanks for your help

There are not 2 but 3 cases, depending of the thickness of the crystal: 1- the incident gamma does not interact in the crystal 2- the incident gamma interact, but only a fraction of its energy is deposited 3- all its energy is deposited.

What is the thickness of your crystal ?

a)You can measure the total energy deposit in the crystal. See examples/novice/N03 or examples/extended/electromagnetic/TestEm3

b) on the opposite you can measure the energy leakage. See TestEm2

If you are interested only by: the incident gamma interacts or not, you can check that this primary gamma leaves, or not, the BGO. Some examples of this are in TestEm5 (although it can be simplified..)

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