Identification and counting of alpha tracks by using an imaging plate

Fading Characteristics of Alpha Radiation Signals Stored in an Imaging Plate

“…Referring to the discrimination method proposed by Saito et al, 6) a new PSL value of 0.25 was recommended as the threshold to discriminate alpha radiation from natural background radiation and system noise for BAS-MS type of IP and BAS-2500 imaging reader system (Fuji Film Co., Ltd.) in our previous study. 9) Furthermore, compared with the traditional method using the PSL values, we also found that the alpha-spot counting method had better linearity and lower detection limit for measurements of alpha radiation, and the fading effect was relatively smaller.…”

“…Our previous study indicated that the identification and counting methods were able to discriminate alpha radiation from background radiation and system noise effectively, provided that the threshold value was set to be 0.25, and the IP had an excellent linear response to alpha particles with an incident intensity ranging from 0.495 particlesÁcm À2 to 5,500 particlesÁcm À2 . ) for the irradiation and readout condition that was as same as that in this study, 9) the activities of the source were calculated with the PSL values and the spot counts measured at different elapsed times after irradiation. Calculated activities of the source were then compared with the reference value.…”

Supervised nuclear track detection of CR-39 detectors by cellular automata

“…They utilized in-house software developed on visual C ++ to analyze the track images presented before by Chen et al (16). The software was able to directly read the image files provided by the IP reader and calculate photo-stimulated luminescence (PSL) values for each pixel.…”

“…The software was able to directly read the image files provided by the IP reader and calculate photo-stimulated luminescence (PSL) values for each pixel. Counting the tracks was based on assigning a PSL value to the tracks higher than the corresponding value for neighboring pixels and again calculating new PSL values according to the equations given in the work of Chen et al (16). Then, exceeding a threshold value resulted to detecting tracks.…”

Fading Characteristics of Alpha Radiation Signals Stored in an Imaging Plate

“…Our previous study indicated that the identification and counting methods were able to discriminate alpha radiation from background radiation and system noise effectively, provided that the threshold value was set to be 0.25, and the IP had an excellent linear response to alpha particles with an incident intensity ranging from 0.495 particlesÁcm À2 to 5,500 particlesÁcm À2 . 9) was irradiated by another 241 Am source with an activity of 179 Bq for 10 and 60 min, and the images were scanned at 1, 60, and 360 min after the irradiation at a controlled room temperature of 20 C. For reducing the statistically evaluated uncertainties, the same experiments were repeated 5 times. According to the previously obtained detection efficiency (0.218 countsÁ(BqÁs) À1 or 0.206 PSLÁ(BqÁs) À1 ) for the irradiation and readout condition that was as same as that in this study, 9) the activities of the source were calculated with the PSL values and the spot counts measured at different elapsed times after irradiation.…”