Role Of Humidity Research Articles

The role of humidity and other correction factors in the AAPM TG-21 dosimetry protocol.

A detailed derivation is presented of the formulas required to determine Ngas and Dmed in the AAPM TG-21 dosimetry protocol. This protocol specifies how to determine the absorbed dose in an electron or photon beam when using exposure or absorbed dose calibrated ion chambers. It is shown that the expression given in TG-21's recent letter of clarification is incorrect. Accounting for humidity correctly increases, by 0.4%, all absorbed dose determinations using an exposure calibrated ion chamber. Taking into account other correction factors in the equation for exposure could also have varying, but significant effects (possibly over 1%). These are the stem scatter correction, the axial nonuniformity correction and the electrode correction for electrodes made of different materials from the wall. Attention is drawn to differences in the definitions of the exposure and absorbed dose calibration factors, Nx and ND, respectively, as supplied by the NBS and the NRCC.

Long-lived radicals in irradiated apatites of biological interest: an e.s.r. study of apatite samples treated with 13CO2.

Hydroxyapatite is used as a model for studying radical formation in the mineral compartment of irradiated calcified tissues. Treating this material with 13C-enriched CO2 confirms that radiogenic long-lived radicals correspond to carbon centred species. It is shown, however, that these radicals are not located on the carbonate ions which substitute either the phosphate or the hydroxyl groups. The conditions which allow the formation and the trapping of these radicals are investigated (role of humidity, CO2 and temperature) and this paramagnetic species is identified as CO-2 adsorbed at the surface of apatite crystallites.

Effect of Relative Humidity on the Corrosion Kinetics of HSLA and Low Carbon Steels

Abstract The role of humidity on the corrosion kinetics of HSLA and mild steels was quantitatively investigated. The test was performed by coupling sheets of steel with copper inside a chamber where preset conditions of relative humidity (RH) and temperature were maintained. A power dependence of the corrosion current on the RH changes like Icorr≈B⋅(ΔRH)X was found. The values of the constants were calculated for all of the steels, thus allowing a comparison of the corrosion rates of the HSLA steel with respect to the mild steel. All five of the HSLA steels examined were found to be more susceptible to corrosion in humid air than were the mild steels.

Wound healing: a review. II. Environmental factors affecting wound healing.

A variety of factors, both intrinsic and extrinsic, may influence the healing of wounds. Some of these influences are environmental in nature and subject to advantageous manipulation by the practitioner. In this article, the role of humidity, temperature, infection and oxygen tension on the process of wound healing will be discussed.

Wound Healing: A Review: II. Environmental Factors Affecting Wound Healing

A variety of factors, both intrinsic and extrinsic, may influence the healing of wounds. Some of these influences are environmental in nature and subject to advantageous manipulation by the practitioner. In this article, the role of humidity, temperature, infection and oxygen tension on the process of wound healing will be discussed.

Humidity in Horticulture1

Abstract Humidity as related to horticulture is discussed in terms of: ways of expressing humidity levels; physical properties of water vapor; and temperature-humidity and air circulation-humidity interactions. The role of humidity in transpiration, killing freezes, and storage and transport of fruits and vegetables is discussed. Also given are sources of information on methods of recording and controlling humidity in postharvest applications.

Role of Humidity in Prevention of Hypothermia in Infants and Children

Role of Humidity in Prevention of Hypothermia in Infants and Children

Operating Room: Informed Consent, Role of Humidity in Normothermia are IARS Topics

Operating Room: Informed Consent, Role of Humidity in Normothermia are IARS Topics

The role of humidity in the differentiation of the celular slime molds.

The role of humidity in the differentiation of the celular slime molds.