Dosimetry: New approaches

McLaughlin, W.L.

doi:10.1016/0969-806x(93)90041-r

Cited by 9 publications

(3 citation statements)

References 28 publications

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“…Radiochromic effects involve the direct coloration of a material by the absorption of energetic radiation, without re-quiring latent chemical, optical, or thermal development or amplification. 2, [8][9][10][11][12][13] The radiochromic process, described in this section, involves the production of immediate permanent colored images of a radiation exposure pattern in a solid, with or without ''fixing'' of the sensor medium against further change. Typical films, protected from further irradiations, can serve as archival radiographic imaging and datastorage media.…”

Section: A Historical Background Of Radiochromic Dosimetersmentioning

confidence: 99%

“…III.͒ Two radiochromic systems that have been developed for radiographic imaging and dosimetry at absorbed doses greater than those used for radiation therapy are thin films containing either amino-triphenylmethane leucodyes or tetrazolium salts as the colorless radiation sensitive ingredients which are changed to deep colors upon irradiation. Historical details and the results of radiation chemical kinetics studies of these systems can be found in a series of publications by McLaughlin et al 2,[11][12][13]18,35,[42][43][44][45][46][47]…”

Section: Radiochromic Filmsmentioning

confidence: 99%

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Radiochromic film dosimetry: Recommendations of AAPM Radiation Therapy Committee Task Group 55

et al. 1998

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Section: A Historical Background Of Radiochromic Dosimetersmentioning

confidence: 99%

Section: Radiochromic Filmsmentioning

confidence: 99%

Radiochromic film dosimetry: Recommendations of AAPM Radiation Therapy Committee Task Group 55

et al. 1998

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“…Since this dose range cannot be covered by a single dosimetry system, more than one system may be needed at a facility. Several dosimetry systems (plastic plates, radiochromic films, chemical solutions, dye systems, phosphors, or glasses) are used for routine food irradiation dosimetry (Broszkiewicz & Bulhak, 1973;ISO/ASTM 51261, 2002;McLaughlin, 1974McLaughlin, , 1977McLaughlin, , 1993McLaughlin, Jarrett, & Olejnik, 1982;McLaughlin, Boyd, Chadwick, McDonald, & Miller, 1989;McLaughlin et al, 1991;Murphy, Kovacs, Miller, & McLaughlin, 2003;Saylor et al, 1988;Sharma, Chilkulwar, & Kumar, 2009).…”

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Dosimetric characterization of LiMgPO₄:Tb,B phosphor for its application in food irradiation

Menon

Singh

Kadam

et al. 2019

J Food Process Preserv

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Optically stimulated luminescence (OSL) intensity versus dose response of indigenously developed LiMgPO4:Tb,B (LMP) disks is linear in the range of 1 mGy–1 kGy. Currently, no other synthetic OSL phosphor is available, which covers such a large dose range. In order to assess the feasibility of using the phosphor in low‐dose food irradiation dosimetry (up to 1 kGy), dosimetric characterization of LMP‐based OSL dosimeter was carried out under both, gamma and electron beam irradiation. The doses estimated by LMP and routine dosimeters match well in the field trials. Hence, this phosphor has the potential to be used in phytosanitary application using radiation, where delivered doses are of the order of 0.01–1 kGy. Practical applications Food irradiation dosimetry, in India, is being carried out using chemical dosimeters such as Fricke, Ceric‐cerous sulphate, and Alanine‐electron paramagnetic resonance. The former two are liquid dosimeters kept in glass tubes and therefore need to be handled delicately during irradiation. The complex chemical preparation, sensitive to environmental conditions (temperature, humidity, etc.) and temperature changes, sensitive to UV radiation and the high sensitivity to impurities make these dosimetry systems inconvenient for routine applications. The OSL intensity versus dose response of indigenously developed LiMgPO4:Tb,B (LMP) has been observed to be linear up to 1 kGy. Apart from good dosimetric qualities, other qualities of the dosimeter system are quick readout, ease of handling, automated readout mechanisms, and integrity in harsh environments. The above‐discussed attributes make LMP‐based OSL dosimeter a potential candidate to carry out dosimetry during phytosanitary application of radiation in low‐dose range (0.01–1 kGy). This range includes irradiation of mangoes, onions, potatoes, etc.

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Radiation Chemistry of Polymers

Hill

Whittaker

2004

Encyclopedia of Polymer Science and Technology

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Polymeric materials are exposed to high energy radiation either deliberately to alter their properties or inadvertently during their use in high dose environments. As a consequence, an understanding of how radiation modifies the polymer structure, and hence properties, is essential for many applications. In addition, the understanding of the degradation of polymers with light or heat can benefit from knowledge of the reaction pathways of radical and charged species formed on irradiation with high energy photons. This article aims to provide a broad overview of the fundamental processes occurring during radiolysis of polymers. This is achieved through a discussion of the interaction of high energy photons with matter, and the subsequent reactions of mainly radical intermediates. Polymers either cross‐link or degrade on exposure to radiation, and the final properties of the polymers depend critically on the balance of these two main reaction pathways. A number of examples are taken from the literature to illustrate how the tendency to undergo cross‐linking or main‐chain scission depends on the polymer structure. The overall yield of reactions can be greatly reduced by the introduction of aromatic groups into the polymer structure. On the other hand, yields can be increased by the inclusion of radiation‐sensitive groups such as sulfones. Similarly, the rates of reactions and the balance between cross‐linking and scission can depend sensitively on the radiolysis temperature. While this review focuses on a discussion of the reactions occurring on radiolysis in vacuo, the effect of the presence of dissolved oxygen on the reaction pathways is also discussed.

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Dosimetry: New approaches

Cited by 9 publications

References 28 publications

Radiochromic film dosimetry: Recommendations of AAPM Radiation Therapy Committee Task Group 55

Radiochromic film dosimetry: Recommendations of AAPM Radiation Therapy Committee Task Group 55

Dosimetric characterization of LiMgPO₄:Tb,B phosphor for its application in food irradiation

Radiation Chemistry of Polymers

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Dosimetry: New approaches

Cited by 9 publications

References 28 publications

Radiochromic film dosimetry: Recommendations of AAPM Radiation Therapy Committee Task Group 55

Radiochromic film dosimetry: Recommendations of AAPM Radiation Therapy Committee Task Group 55

Dosimetric characterization of LiMgPO4:Tb,B phosphor for its application in food irradiation

Radiation Chemistry of Polymers

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Dosimetric characterization of LiMgPO₄:Tb,B phosphor for its application in food irradiation