A passive radon dosimeter based on the combination of a track etch detector and activated charcoal

Deynse, Annick Van; Cosma, C.; Poffijn, A.

doi:10.1016/s1350-4487(99)00152-3

Cited by 20 publications

(6 citation statements)

References 9 publications

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“…Since track detectors are already characterized by an accumulation-type of response, they can be successfully combined only with activated charcoal equilibrium-type of samplers. Equilibrium-type of sampling by activated carbon adjacent to a track detector has been obtained by Van Deynse et al (1999), who have been using thin layers of activated carbon.…”

Section: Pe Bagmentioning

confidence: 99%

Radon-film-badges by solid radiators to complement track detector-based radon monitors

Tommasino¹,

Tommasino²,

Viola³

2009

Radiation Measurements

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Section: Pe Bagmentioning

confidence: 99%

Radon-film-badges by solid radiators to complement track detector-based radon monitors

Tommasino¹,

Tommasino²,

Viola³

2009

Radiation Measurements

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“…The track detector/AC monitor proposed by Sutej et al [9] had also some shortcomings such as its response sensitivity, which may depend on the particular time of the exposure, especially because the activated charcoal is used as a non-equilibrium-type sampler [4]. The equilibrium-type of sampling by using thin layers of activated carbon adjacent to a track detector of Van Deynse et al [10] has also been subject to some shortcomings such as high cost, practical difficulties due to their grain-type morphology, and humidity-dependent adsorption characteristics [4].…”

Section: Discussionmentioning

confidence: 99%

“…One of the main problems in using passive radon monitors based on bare polymers with no external irradiator has been lack of enough sensitivity for short-term radon measurements indoors and outdoors requiring monitoring periods sometimes up to 6 months. Efforts have been in progress to enhance the sensitivity of such detectors by applying an external adsorbing material such as activated charcoal (AC) powder or in layers in contact with a polymer track detector [4,9,10]. Sutej et al [9] by using CR-39/AC layer first reported a two times higher sensitivity enhancement compared to that of bare CR-39.…”

Section: Introductionmentioning

confidence: 99%

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Concentration and duration dependence of a new prototype polycarbonate/activated-carbon fabric individual and environmental radon monitor

Sohrabi

Ebrahiminezhad

2018

J. Inst.

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The basic design of new multi-purpose polycarbonate track detector (PCTD)/activated-carbon-fabric (ACF) detector for radon monitoring in particular for parametric studies has been recently self-invented in our laboratory by enhancing PCTD's sensitivity by using the ACF adsorptive layer as external alpha radiator. The PCTD/ACF monitor basically consists of a PCTD; half bare and half covered with ACF in order to adsorb radon on its carbon active sites. From parameters studied, radon concentration and exposure duration were discovered to be the most important parameters affecting the monitor's sensitivity enhancement. An amplification factor (AF), defined as ratio of net PCTD/ACF to PCTD/bare alpha track density responses after background track density subtraction, was found being highly dependent on the two stated parameters. The AF versus duration response is flat with a value ∼1.5 constant up to 32 days in ∼180±20 Bq.m−3 radon environment and also flat with a constant value ∼7.5 up to 8 days in ∼25±1.1 kBq.m−3 radon environment after which the AF decreases down to ∼3.0 up to 32 days exposure. This phenomenon seems be due to full occupancy of radon atoms on the ACF active sites at high concentrations with an equilibrium between adsorption and desorption processes. The latter significantly dominates after 8 days in ∼25±1.1 kBq.m−3 environment leaving behind non-active sites requiring regeneration. The prototype monitor developed can be applied to normal level individual and/or environmental radon monitoring for an extended period of time but to high radon concentrations for short-term such as a week as a “grab sampler” with a high prospect for determination of radon equilibrium factor with its progeny in the radon environment under measurement. The actual radon monitor and its parametric studies are under further development.

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“…Such passive radon monitors have been under development for many decades. Such developent historically includes radon film badge with nuclear track emulsion 9 , or most widely used polymer track detectors such as cellulose nitrate 10 , LR-115 12 , 13 ; CR-39 14 , 15 ; PCTD 16 – 21 , Makrofol and activated charcoal 22 ; CR-39 with activated carbon fabric (ACF) (CR-39/ACF) 23 , and PCTD/ACF radon monitors have been well studied and used 20 , 21 . Some researchers have even applied miniature pumps in a small pen-type monitor to collect air radon/progency and particulates on a filter in contact with a passive track detector to enhance the response 10 , 24 .…”

Section: Introductionmentioning

confidence: 99%

Breakthrough on radon individual monitoring and protecting miners by novel dual-function monitor on respirator

Sohrabi,

Khodaee

2023

Sci Rep

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Breakthrough is made on inventing, producing and applying novel dual-function passive individual radon monitor in canister on respirators for radon inhalation monitoring and protecting individuals in particular miners. The rationale in this invention is having individual monitors for determining actual naturally inhaled radon by individuals and protection against particulates in one device. The monitor comprises two passive polycarbonate track detectors (PCTD); one near canister orifice (PCTD/bare), and one under activated carbon fabric (PCTD/ACF) to detect alphas of radon adsorbed on ACF carbon active sites. The PCTD/ACF detects radon with 12.7 times more sensitivity than PCTD/bare; called “Forced Amplification Factor (FAF)”. Monitors were successfully operated and calibrated in laboratory radon chamber using low suction rate pump resembling human natural inhalation. The performance of monitor showed high promises for radon individual monitoring and protection. This novel development also opens new horizons for fundamental and practical scientific research to further upgrade the monitor.

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A passive radon dosimeter based on the combination of a track etch detector and activated charcoal

Cited by 20 publications

References 9 publications

Radon-film-badges by solid radiators to complement track detector-based radon monitors

Radon-film-badges by solid radiators to complement track detector-based radon monitors

Concentration and duration dependence of a new prototype polycarbonate/activated-carbon fabric individual and environmental radon monitor

Breakthrough on radon individual monitoring and protecting miners by novel dual-function monitor on respirator

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