Search Result of "Tidarut Vichaidid"

About 2 results
Img

ที่มา:วิทยาสารเกษตรศาสตร์ สาขา วิทยาศาสตร์

หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Comparative Study on U, Th and K Concentrations in Sediments at the Mae Moh Mine and Lam Phra Phloeng Dam)

ผู้เขียน:ImgTidarut Vichaidid, ImgThongchai Soodprasert, ImgNatnalin Sastri, ImgSasimonton Moungsrijun

สื่อสิ่งพิมพ์:pdf

Abstract

The concentration of uranium, thorium and potassium in sediment matrices, collected from the Mae Moh mine in Lampang Province, Northern Thailand and from the Lam Phra Phloeng Dam on Nakhon Ratchasima Province, Northeastern Thailand were determined using gamma spectrometry together with a neutron activation analysis technique (NAA). A high purity germanium (HPGe) welltype detector and digital spectrometer were calibrated by reference standard sources to obtain high efficiency for the quantitative evaluation. The concentration of uranium, thorium, and potassium of the Mae Moh mine samples achieved by these techniques was in the range 0.08 to 1.40 ppm, 4.60 to 6.70 ppm, and 0.80 to 1.50%, respectively and significantly lower than the samples collected from the Lam Phra Phloeng Dam which were in the range 2.28 to 2.96 ppm, 8.43 to 16.01 ppm, and 2.04 to 3.30%, respectively. It was shown that the concentration of naturally occurring radioactive materials (NORM) depended on the type and formation age of the sediment.

Article Info
Agriculture and Natural Resources -- formerly Kasetsart Journal (Natural Science), Volume 043, Issue 5, Dec 09 - Dec 09, Page 379 - 384 |  PDF |  Page 

Img

ที่มา:วิทยาสารเกษตรศาสตร์ สาขา วิทยาศาสตร์

หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Determination of U, Th and K in Sediments and Fossil Collected from Mae Moh Mine Using Gamma-Ray Spectrometry and Neutron Activation Analysis (NAA))

ผู้เขียน:ImgTidarut Vichaidid, ImgThongchai Soodprasert, ImgNatnalin Sastri, ImgChutima Oopathum, Imgพิเชษฐ ลิ้มสุวรรณ

สื่อสิ่งพิมพ์:pdf

Abstract

The annual environmental dose in sediment and fossil shells matrices, collected from Mae Moh mine, Lampang province, Northern Thailand has been determined by using gamma spectrometry together with neutron activation analysis technique (NAA). This analysis technique was adopted by activating NBS standard reference materials (NBS SRM 2709: San Joaquin Soil) and sediment matrices at the same condition before measuring them at the specific time schedule. High Purity Germanium (HPGe) well type detector and spectrometer were calibrated to get efficiency ratio by reference standard sources. Most of natural radioactive elements are members of uranium, thorium and from non series nuclides, mainly potassium. The result concentration of uranium, thorium, and potassium in samples can be achieved by this technique and found to be in the range of 0.02 to 3.05 ppm, 0.04 to 11.00 ppm, and 0.01 to 1.53% respectively. The annual environmental dose is between 87-3000 mGy, depended on type of metrics, and can be specifically calculated and used for dating around the Middle Miocene time scale.

Article Info
Agriculture and Natural Resources -- formerly Kasetsart Journal (Natural Science), Volume 042, Issue 5, Dec 99 - Dec 99, Page 333 - 339 |  PDF |  Page