Detector Nai (Tl)
In the crystal material sintilator (NAI (Tl)) there are bands called as the valence band and conduction band of separated by a certain energy level.
In ground state, ground state, all electrons located at the valence band, when the crystal Nai (Tl) exposed to radiation there is the possibility that energy will be absorbed by a few electrons in the valence band so the band jumped into conduction. A few moments later elektronelektron it will return to the valence band through the activator material energy bands as emit sparks of light. Amount spark of light is proportional to the energy radiation is absorbed and dipengruhi by type sintilatornya materials. (diktat protection officer radiation)
Photo Multiplier Tube (PMT)
Photomultiplier tubes are made of vacuum tube with a light-proof photokatoda that serves as the sensor light at one end. Photokatoda attached to sintilator materials, will emits electrons when subjected to spark light. The electrons produced would directed, with a potential difference, to
first dinode. Will Dinode emits several secondary electrons when charged by electrons.
Secondary electrons which The first results will dinode to dinode second and later doubled to dinode The third and so on so that the electrons collected in the last dinode numbered very much. With a capacitor collection of electrons will be changed into electrical pulses. (diktat protection officer radiation)
WORK PROCEDURES
The design and manufacture counter Mikokonroler based RIA consists of two types , Namely the design and manufacture devices hardware (hardware) and software (programs control microcontroller). Here is block diagram of the design RIA counter based mikorokontroler: