OSLD Remote Dosimetry Program

 

When OSL material is irradiated and the signal is subsequently stimulated using UV light of a certain frequency, it will emit light which is related to:  

 

·         Absorbed dose in the material  

·         Intensity of the stimulating light  

·         Individual dosimeter respose properties 

·         Reader sensitivity  

·         Energy of the radiation  

·         Linearity of light emitted per unit dose  

·         Retention of the stored signal  

 

IROC Houston commissions every new batch of OSL dosimeters to be used in our mailed OSLD program. The commissioning process includes determination of individual dosimeter response characteristics (ECF), verification of the fading correction, non-linearity correction, energy correction and dose response (sensitivity). The OSLD dose is determined as follows:

 

D = S x R x ECF x K_F x K_L x K_E x K_ISQ x PSF / DDF x K_DECAY

 

S            =        System sensitivity determined each session  

R            =        Sample response  

ECF         =        Element Corection Factor

K_F           =        Fading correction (range 3-180 days)  

K_L           =        Non-linearity correction (doses 25 - 350 cGy)  

K_E          =        Energy correction (photons: ⁶⁰Co - 25 MV, electrons: 5 - 25 MeV)  

K_ISQ       =        Inverse square correction  

F            =        Peak scatter factor for dose to full phantom  

DDF       =        Depth dose factor

K_DECAY   =        Decay correction for ⁶⁰Co measurements