https://doi.org/10.1140/epjd/s10053-023-00765-8
Regular Article – Atomic and Molecular Collisions
The range of 208Tl from 212Bi decay in collodion thin films
1
Nuclear Research Center NEGEV, P.O. Box 9001, 84190, Beer-Sheva, Israel
2
Physics Department, Ben-Gurion University of the Negev, 84105, Beer-Sheva, Israel
Received:
22
July
2023
Accepted:
5
October
2023
Published online:
2
November
2023
We measured the effective range of ~116 keV 208Tl ions in extremely thin films of Collodion (C6H8N2O9). The 208Tl ions were obtained from the 
decay of 212Bi, being emitted in the 220Rn decay chain. The amount of the stopped 208Tl ions in each Collodion film was determined by measuring the short-lived (~3 m) 
activity of 208Tl where the effective range was found to be 11.69 ± 0.35 µg/cm2. This value is in agreement (~15%) with Monte Carlo simulations using the SRIM and TRIM software packages which calculate the ions average range in Collodion resulting in a value of 10.14 ± 0.31 µg/cm2. The range of the 116 keV 208Tl ions in Collodion as measured here was found to be ~11% larger than the literature range in Carbon of the 120 keV doubly charged 205Tl ions (produced by an accelerator) and reported to be 10.5 µg/cm2. In Carbon, the measured value was also higher than the SRIM simulated value by ~11%. The results seem also to reveal no dependence on the charge of the projectile. We also found that the measured spectrum width is wider by a factor 2.4 than the simulated value. We attribute this deviation to a partial energy reduction of 208Tl ions resulting from both diffusion and decay of the 220Rn and its daughters into the Al substrate holding the source, to errors in the film thickness and also to an overestimation of the SRIM stopping power.
Supplementary Information The online version contains supplementary material available at https://doi.org/10.1140/epjd/s10053-023-00765-8.
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