Significant annual and sub-annual cycles in indoor radon concentrations: seasonal variation and correction

Robin G M Crockett, Chris J Groves-Kirkby, Anthony R Denman, Paul S Phillips, Gavin K Gillmore (Editor), Frédéric Perrier (Editor), Robin G M Crockett (Editor)

Research output: Contribution to Book/Report typesChapterResearchpeer-review

Abstract

The majority of radon measurements in the built environment are made over sub-year periods and are then generally seasonally corrected, i.e. scaled by an appropriate Seasonal Correction Factor (SCF), to estimate the annual average radon concentration. SCFs are statistically derived and assume an underlying annual cycle, reflecting the widely observed seasonal variation in indoor radon concentrations. In the UK, Public Health England has pioneered the calculation and use of a national SCF-set using an annual sinusoidal model for variations in radon concentration and averaging across the entire country. To test the validity of that model, a four-year record of weekly radon data from four houses in Brixworth (Northamptonshire, UK) was analysed in conjunction with corresponding weather data for the period from a nearby weather station. The radon data showed a statistically significant annual cycle comprising both annual sinusoidal and second harmonic (i.e. six-month period) terms. Two sets of SCFs were calculated. First, using a conventional annual sinusoidal model, which explained 21.2% of the variance in the radon data. Second, a second harmonic term was included in the model, which explained 24.6% of the variance. This represents an improvement of 3.4 percentage points (15.9%) and, thus, will result in better SCFs.
Original languageEnglish
Title of host publicationRadon, Health and Natural Hazards
Place of PublicationLondon
PublisherGeological Society
PagesSP451.2
Number of pages256
VolumeSP451
ISBN (Print)9781786203083
Publication statusPublished - 20 Apr 2018

Publication series

NameSpecial Publications

Fingerprint

indoor radon
radon
annual cycle
seasonal variation
weather station
public health
weather

Keywords

  • Radon
  • built environment
  • time-series
  • annual cycles
  • seasonal correction

Cite this

Crockett, R. G. M., Groves-Kirkby, C. J., Denman, A. R., Phillips, P. S., Gillmore, G. K. (Ed.), Perrier, F. (Ed.), & Crockett, R. G. M. (Ed.) (2018). Significant annual and sub-annual cycles in indoor radon concentrations: seasonal variation and correction. In Radon, Health and Natural Hazards (Vol. SP451, pp. SP451.2). (Special Publications). London: Geological Society.
Crockett, Robin G M ; Groves-Kirkby, Chris J ; Denman, Anthony R ; Phillips, Paul S ; Gillmore, Gavin K (Editor) ; Perrier, Frédéric (Editor) ; Crockett, Robin G M (Editor). / Significant annual and sub-annual cycles in indoor radon concentrations: seasonal variation and correction. Radon, Health and Natural Hazards. Vol. SP451 London : Geological Society, 2018. pp. SP451.2 (Special Publications).
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Crockett, RGM, Groves-Kirkby, CJ, Denman, AR, Phillips, PS, Gillmore, GK (ed.), Perrier, F (ed.) & Crockett, RGM (ed.) 2018, Significant annual and sub-annual cycles in indoor radon concentrations: seasonal variation and correction. in Radon, Health and Natural Hazards. vol. SP451, Special Publications, Geological Society, London, pp. SP451.2.

Significant annual and sub-annual cycles in indoor radon concentrations: seasonal variation and correction. / Crockett, Robin G M; Groves-Kirkby, Chris J; Denman, Anthony R; Phillips, Paul S; Gillmore, Gavin K (Editor); Perrier, Frédéric (Editor); Crockett, Robin G M (Editor).

Radon, Health and Natural Hazards. Vol. SP451 London : Geological Society, 2018. p. SP451.2 (Special Publications).

Research output: Contribution to Book/Report typesChapterResearchpeer-review

TY - CHAP

T1 - Significant annual and sub-annual cycles in indoor radon concentrations: seasonal variation and correction

AU - Crockett, Robin G M

AU - Groves-Kirkby, Chris J

AU - Denman, Anthony R

AU - Phillips, Paul S

A2 - Gillmore, Gavin K

A2 - Perrier, Frédéric

A2 - Crockett, Robin G M

PY - 2018/4/20

Y1 - 2018/4/20

N2 - The majority of radon measurements in the built environment are made over sub-year periods and are then generally seasonally corrected, i.e. scaled by an appropriate Seasonal Correction Factor (SCF), to estimate the annual average radon concentration. SCFs are statistically derived and assume an underlying annual cycle, reflecting the widely observed seasonal variation in indoor radon concentrations. In the UK, Public Health England has pioneered the calculation and use of a national SCF-set using an annual sinusoidal model for variations in radon concentration and averaging across the entire country. To test the validity of that model, a four-year record of weekly radon data from four houses in Brixworth (Northamptonshire, UK) was analysed in conjunction with corresponding weather data for the period from a nearby weather station. The radon data showed a statistically significant annual cycle comprising both annual sinusoidal and second harmonic (i.e. six-month period) terms. Two sets of SCFs were calculated. First, using a conventional annual sinusoidal model, which explained 21.2% of the variance in the radon data. Second, a second harmonic term was included in the model, which explained 24.6% of the variance. This represents an improvement of 3.4 percentage points (15.9%) and, thus, will result in better SCFs.

AB - The majority of radon measurements in the built environment are made over sub-year periods and are then generally seasonally corrected, i.e. scaled by an appropriate Seasonal Correction Factor (SCF), to estimate the annual average radon concentration. SCFs are statistically derived and assume an underlying annual cycle, reflecting the widely observed seasonal variation in indoor radon concentrations. In the UK, Public Health England has pioneered the calculation and use of a national SCF-set using an annual sinusoidal model for variations in radon concentration and averaging across the entire country. To test the validity of that model, a four-year record of weekly radon data from four houses in Brixworth (Northamptonshire, UK) was analysed in conjunction with corresponding weather data for the period from a nearby weather station. The radon data showed a statistically significant annual cycle comprising both annual sinusoidal and second harmonic (i.e. six-month period) terms. Two sets of SCFs were calculated. First, using a conventional annual sinusoidal model, which explained 21.2% of the variance in the radon data. Second, a second harmonic term was included in the model, which explained 24.6% of the variance. This represents an improvement of 3.4 percentage points (15.9%) and, thus, will result in better SCFs.

KW - Radon

KW - built environment

KW - time-series

KW - annual cycles

KW - seasonal correction

M3 - Chapter

SN - 9781786203083

VL - SP451

T3 - Special Publications

SP - SP451.2

BT - Radon, Health and Natural Hazards

PB - Geological Society

CY - London

ER -

Crockett RGM, Groves-Kirkby CJ, Denman AR, Phillips PS, Gillmore GK, (ed.), Perrier F, (ed.) et al. Significant annual and sub-annual cycles in indoor radon concentrations: seasonal variation and correction. In Radon, Health and Natural Hazards. Vol. SP451. London: Geological Society. 2018. p. SP451.2. (Special Publications).