Physics and Engineering of Radiation Detection

324 Chapter 6. Scintillation Detectors and Photodetectors

Figure 6.1.3: Energy resolution of some commonly used scintillators for 662

keV γ-rays as a function of their luminosity (34).

application. for example the range of the wavelengths of the emitted photons must
also be matched with the sensitivity of the photodetector.

Example:

Convert the light yield of anthracene into efficiency for producing blue

scintillation light.

Solution:

The light yield of anthracene is 20,000 photons perMeV. The efficiency can

be defined as

η=

Total Energy of Photons Produced

Total Energy Delivered

× 100

The wavelength of blue photons is aboutλ=0. 47 × 10 −^6 μm. This corresponds

to an energy of

Eγ =

hc

λ

=

(

6. 63 × 10 −^34

)(

2. 99 × 108

)

0. 47 × 10 −^6

=4. 22 × 10 −^19 J

=

4. 22 × 10 −^19

1. 602 × 10 −^19

=2. 63 eV.