Calibration factors for LR-115 (type-II) based radon thoron discriminating dosimeter

Eappen, K.P.; Mayya, Y. S.

doi:10.1016/j.radmeas.2003.09.003

Cited by 153 publications

(57 citation statements)

References 15 publications

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“…At last, using an optical microscope for counting the number of tracks. The calibration factor for dosimeters exposed for range from (5-30) day to Radium 226 Ra (Radon source) of activity 3.3 kBq was calculated to be (0.0217±0.0033) (track/cm 2 )/(Bq.day/m 3 ), which agree well within the reported in many works (Eappen and Mayya, 2004;Pundir et al, 2014;Duggal et al, 2014).…”

Section: Experimental Partsupporting

confidence: 88%

“…Experimental methods of radon measurements were based on alphacounting of radon and its daughters. The SSNTD detector (LR-115 type II) is a cellulose nitrate film of 12 µm thickness manufactured by Kodak Path, France (Eappen and Mayya, 2004). The radon dosimeter employed for this work measurements is made of a plastic cup of 10 cm in diameter with a depth of 13 cm.…”

Section: Experimental Partmentioning

confidence: 99%

See 1 more Smart Citation

Radiation Hazards Due to Radon Concentrations in Dwellings of Kufa Technical Institute, 'Iraq'

Abojassim

Husain²

2016

Physics International

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Section: Experimental Partsupporting

confidence: 88%

Section: Experimental Partmentioning

confidence: 99%

Radiation Hazards Due to Radon Concentrations in Dwellings of Kufa Technical Institute, 'Iraq'

Abojassim

Husain²

2016

Physics International

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“…These dosimeters are brought back to the laboratory after stipulated exposure periods and processed the films using standard protocols for track development [5]. In the present study, dosimeters were selected from the various categories of employees, to cover the exposure ranges inside the mines, and processed the films for track developments and the etched track films were counted first by optical microscope followed by spark counting.…”

Section: Methodsmentioning

confidence: 99%

Estimate of etched tracks by optical method and spark counting

et al. 2009

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: Solid State Nuclear Track Detectors (SSNTD) are commonly used for long term measurements of radon, thoron and progeny concentrations. In the present study, we compared the optical counting method and the spark counting technique for counting the alpha tracks on LR 115 track detector films. The paper discusses the various parameters that are innate in the process. More than 300 films were counted by both optical microscope and spark counter and the results are compared. The overall results show that the tracks obtained by spark counting are marginally less compared to the optical measurement. A linear fit of the data gives a slope less that one, which indicates that both the methods are almost in good agreement for counting the tracks when the track density is low. At higher track densities the spark counter gives an underestimation with respect to actual number of tracks formed, which could be corrected using a relation obtained between the tracks measured by optical method and spark counting.

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“…This thickness is called the break down thickness for spark counter which is unique for each spark counter. Eappen and Mayya [12] in their studies had found that the breakdown thickness is 3 mm for the system they used.…”

Section: Alpha Track Countingmentioning

confidence: 99%

Factors affecting the registration and counting of alpha tracks in solid state nuclear track detectors

Eappen

Mayya

2009

Indian J Phys

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:In view of the fact that the radon progeny contribute the highest to the natural radiation dose to general populations, large scale and long-term measurements of radon and its progeny in the houses have been receiving considerable attention. Solid State Nuclear Track Detector (SSNTD) based systems, being the best suited for large scale passive monitoring, have been widely used for the radon gas (using a cup closed with a semi-permeable membrane) and to a limited extent, for the measurement of radon progeny (using bare mode in conjunction with the cup). These have been employed for radon mapping and indoor radon epidemiological studies with good results. In this technique, alpha tracks recorded on SSNTD films are converted to radon/thoron concentrations using corresponding conversion factors obtained from calibration experiments carried out in controlled environments.The detector response to alpha particles depends mainly on the registration efficiency of the alpha tracks on the detector films and the subsequent counting efficiency. While the former depends on the exposure design, the latter depends on the protocols followed for developing and counting of the tracks. The paper discusses on parameters like etchant temperature, stirring of the etchant and duration of etching and their influence on the etching rates on LR-115 films. Concept of break down thickness of the SSNTD film in spark counting technique is discussed with experimental results. Error estimates on measurement results as a function of background tracks of the films are also discussed in the paper.

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Calibration factors for LR-115 (type-II) based radon thoron discriminating dosimeter

Cited by 153 publications

References 15 publications

Radiation Hazards Due to Radon Concentrations in Dwellings of Kufa Technical Institute, 'Iraq'

Radiation Hazards Due to Radon Concentrations in Dwellings of Kufa Technical Institute, 'Iraq'

Estimate of etched tracks by optical method and spark counting

Factors affecting the registration and counting of alpha tracks in solid state nuclear track detectors

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Calibration factors for LR-115 (type-II) based radon thoron discriminating dosimeter

Cited by 153 publications

References 15 publications

Radiation Hazards Due to Radon Concentrations in Dwellings of Kufa Technical Institute, &#039;Iraq&#039;

Radiation Hazards Due to Radon Concentrations in Dwellings of Kufa Technical Institute, &#039;Iraq&#039;

Estimate of etched tracks by optical method and spark counting

Factors affecting the registration and counting of alpha tracks in solid state nuclear track detectors

Contact Info

Product

Resources

About

Radiation Hazards Due to Radon Concentrations in Dwellings of Kufa Technical Institute, 'Iraq'

Radiation Hazards Due to Radon Concentrations in Dwellings of Kufa Technical Institute, 'Iraq'