[en] For different thicknesses (20-200 mg/cm₂) of CaSO₄:Dy-teflon TL dosemeters, the response to beta radiation (²⁰⁴Tl, ¹⁷⁰Tm, ⁹⁰Sr-Y and Nat.U) and ¹³⁷Cs gamma radiation has been measured. Theoretical calculations of energy absorbed in the TL material for normal incidence of beta spectra has been carried out using Monte Carlo method. Agreement between theoretical and experimental values is very good for ⁹⁰Sr-Y whereas it is within 10% for ²⁰⁴Tl. A thickness of 80 mg/cm₂ was found to be optimum for use as dosemeters and has been adopted for large scale use. (author). 4 refs., 1 tab