Sampling Method of Radionuclides in the Atmosphere

The technique for collecting radionuclides is to use an air sampler fitted with a filter that is connected to an air pump to collect radionuclide samples. The typical flow rate through an air filter using a 1 hp pump is about 1 m min~ . A pressure gauge is usually installed

180° 150° W 120° W 90° W 60° W 30° W 0° 30° E 60° E 90° E 120° E 150° E 180° N Pole N Pole

S Pole

180° 150° W 120° W 90° W 60° W 30° W 0° 30° E 60° E 90° E 120° E 150° E 180° N Pole N Pole

S Pole

S Pole

180° 150° W 120° W 90° W 60° W 30° W 0° 30° E 60° E 90° E 120° E 150° E 180°

Longitude

Figure 2 Model-calculated global distributions of yearly mean total deposition (Bq m^yr-1) of 210Pb for the year 2002. From Lee HN, Wan G, Zheng X, et al. (2004) Measurements of 210Pb and 7Be in China and their analysis accompanied with global model calculations of 210Pb. Journal of Geophysical Research (Atmospheres) 109: D22203 (doi: 10.1029/2004JD005061).

S Pole

abo. 200 150-200 I [100-150 I I50-100 10-50 bel. 10

180° 150° W 120° W 90° W 60° W 30° W 0° 30° E 60° E 90° E 120° E 150° E 180°

Longitude

Figure 2 Model-calculated global distributions of yearly mean total deposition (Bq m^yr-1) of 210Pb for the year 2002. From Lee HN, Wan G, Zheng X, et al. (2004) Measurements of 210Pb and 7Be in China and their analysis accompanied with global model calculations of 210Pb. Journal of Geophysical Research (Atmospheres) 109: D22203 (doi: 10.1029/2004JD005061).

in the air sampler for measuring air flow as a function of air pressure drop across the filter. The filter is changed daily or weekly depending on the radioactivity levels in the atmosphere. Typically the filter is made of a 20.3 x 25.4cm rectangle with an effective exposure area of about 407 cm and is composed of three layers of 100% polypropylene fibers. Increasing the flow rate of the sampler is the easiest way to increase the sensitivity for isotopes with short half-lives or low fission yields. The filter samples collected are then brought back to laboratory for counting and analysis.

Oplan Termites

Oplan Termites

You Might Start Missing Your Termites After Kickin'em Out. After All, They Have Been Your Roommates For Quite A While. Enraged With How The Termites Have Eaten Up Your Antique Furniture? Can't Wait To Have Them Exterminated Completely From The Face Of The Earth? Fret Not. We Will Tell You How To Get Rid Of Them From Your House At Least. If Not From The Face The Earth.

Get My Free Ebook


Post a comment