Effects of total dose on energy dependence of TLD-Ioo LiF dosimeters

W. R. Hendee; G. S. Ibbott; D. B. Gilbert

doi:10.1016/0020-708X(68)90095-1

Effects of total dose on energy dependence of TLD-Ioo LiF dosimeters

W. R. Hendee, G. S. Ibbott, D. B. Gilbert

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

Abstract

Harshaw TLD-100 Lif in polyethylene capsules was irradiated to doses of 20, 100, 400, 800 and 1500 rads. Radiation modalities used were 24,36,57 and 135 keV X-rays and ⁶⁰Co gamma radiation. Powder was stored for 24 hr before readout to reduce errors resulting from short term fading. Photo-multiplier high voltage for the readout instrument was selected for each dose from an optimum dose-voltage chart. Thermoluminescence ratios were obtained by dividing LiF response to each dose and x-ray quality by luminescence from phosphor receiving an identical dose from ⁶⁰Co radiation. Ratios for each beam quality were plotted as functions of total dose. straight lines with coefficients determined by the least squares method were drawn through experimental points for each beam quality. Energy dependence curves for each total dose were obtained from the straight lines. Increased luminescence at lower photon energies was observed for each total dose. Suppression of degree of energy dependence was apparent at higher doses. Decreased energy dependence of TLD-100 LiF dosimeters at higher doses was attributed to greater efficiency of ⁶⁰Co radiation in producing radiation-induced electron traps in LiF.

Original language	English (US)
Pages (from-to)	431-437
Number of pages	7
Journal	The International Journal Of Applied Radiation And Isotopes
Volume	19
Issue number	5
DOIs	https://doi.org/10.1016/0020-708X(68)90095-1
State	Published - May 1968
Externally published	Yes

ASJC Scopus subject areas

Radiation
Nuclear Energy and Engineering
Radiology Nuclear Medicine and imaging

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@article{fe1a67816f964b43aa352ea93ef2d446,

title = "Effects of total dose on energy dependence of TLD-Ioo LiF dosimeters",

abstract = "Harshaw TLD-100 Lif in polyethylene capsules was irradiated to doses of 20, 100, 400, 800 and 1500 rads. Radiation modalities used were 24,36,57 and 135 keV X-rays and 60Co gamma radiation. Powder was stored for 24 hr before readout to reduce errors resulting from short term fading. Photo-multiplier high voltage for the readout instrument was selected for each dose from an optimum dose-voltage chart. Thermoluminescence ratios were obtained by dividing LiF response to each dose and x-ray quality by luminescence from phosphor receiving an identical dose from 60Co radiation. Ratios for each beam quality were plotted as functions of total dose. straight lines with coefficients determined by the least squares method were drawn through experimental points for each beam quality. Energy dependence curves for each total dose were obtained from the straight lines. Increased luminescence at lower photon energies was observed for each total dose. Suppression of degree of energy dependence was apparent at higher doses. Decreased energy dependence of TLD-100 LiF dosimeters at higher doses was attributed to greater efficiency of 60Co radiation in producing radiation-induced electron traps in LiF.",

author = "Hendee, {W. R.} and Ibbott, {G. S.} and Gilbert, {D. B.}",

note = "Funding Information: * Supported by grant 68108 from The Milheim Foundation and grant 60209 from the Bent County Colorado, Cancer Research Fund. t Present address: Willamette University, Salem, Oregon. ++ Present address: Western State College of Colorado, Gunnison, Colorado.",

year = "1968",

month = may,

doi = "10.1016/0020-708X(68)90095-1",

language = "English (US)",

volume = "19",

pages = "431--437",

journal = "The International Journal Of Applied Radiation And Isotopes",

issn = "0020-708X",

publisher = "Elsevier Limited",

number = "5",

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T1 - Effects of total dose on energy dependence of TLD-Ioo LiF dosimeters

AU - Hendee, W. R.

AU - Ibbott, G. S.

AU - Gilbert, D. B.

N1 - Funding Information: * Supported by grant 68108 from The Milheim Foundation and grant 60209 from the Bent County Colorado, Cancer Research Fund. t Present address: Willamette University, Salem, Oregon. ++ Present address: Western State College of Colorado, Gunnison, Colorado.

PY - 1968/5

Y1 - 1968/5

N2 - Harshaw TLD-100 Lif in polyethylene capsules was irradiated to doses of 20, 100, 400, 800 and 1500 rads. Radiation modalities used were 24,36,57 and 135 keV X-rays and 60Co gamma radiation. Powder was stored for 24 hr before readout to reduce errors resulting from short term fading. Photo-multiplier high voltage for the readout instrument was selected for each dose from an optimum dose-voltage chart. Thermoluminescence ratios were obtained by dividing LiF response to each dose and x-ray quality by luminescence from phosphor receiving an identical dose from 60Co radiation. Ratios for each beam quality were plotted as functions of total dose. straight lines with coefficients determined by the least squares method were drawn through experimental points for each beam quality. Energy dependence curves for each total dose were obtained from the straight lines. Increased luminescence at lower photon energies was observed for each total dose. Suppression of degree of energy dependence was apparent at higher doses. Decreased energy dependence of TLD-100 LiF dosimeters at higher doses was attributed to greater efficiency of 60Co radiation in producing radiation-induced electron traps in LiF.

AB - Harshaw TLD-100 Lif in polyethylene capsules was irradiated to doses of 20, 100, 400, 800 and 1500 rads. Radiation modalities used were 24,36,57 and 135 keV X-rays and 60Co gamma radiation. Powder was stored for 24 hr before readout to reduce errors resulting from short term fading. Photo-multiplier high voltage for the readout instrument was selected for each dose from an optimum dose-voltage chart. Thermoluminescence ratios were obtained by dividing LiF response to each dose and x-ray quality by luminescence from phosphor receiving an identical dose from 60Co radiation. Ratios for each beam quality were plotted as functions of total dose. straight lines with coefficients determined by the least squares method were drawn through experimental points for each beam quality. Energy dependence curves for each total dose were obtained from the straight lines. Increased luminescence at lower photon energies was observed for each total dose. Suppression of degree of energy dependence was apparent at higher doses. Decreased energy dependence of TLD-100 LiF dosimeters at higher doses was attributed to greater efficiency of 60Co radiation in producing radiation-induced electron traps in LiF.

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Effects of total dose on energy dependence of TLD-Ioo LiF dosimeters

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