เปรียบเทียบวิธี

	การหาอายุด้วยคาร์บอน-14	ดัชนีปริมาณน้ำฝนมาตรฐาน
สาขาวิชา	ธรณีฟิสิกส์	ธรณีฟิสิกส์
ตระกูล	Process / pipeline	Process / pipeline
ปีกำเนิด	1949	1993
ผู้ริเริ่ม	Willard Libby	Thomas McKee, Neil Doesken, and John Kleist
ประเภท	Chronometric method based on ¹⁴C decay	Probabilistic drought indicator
แหล่งต้นตำรับ	Libby, W. F. (1949). Radiocarbon dating. University of Chicago Press.	McKee, T. B., Doesken, N. J., & Kleist, J. (1993). The relationship of drought frequency and duration to time scales. Proceedings of the Eighth Conference on Applied Climatology, 179-184.
ชื่อเรียกอื่น	¹⁴C dating, Carbon-14 dating	SPI
ที่เกี่ยวข้อง	3	3
สรุป	Radiocarbon dating is a radiometric technique that determines the age of organic materials by measuring the radioactive decay of ¹⁴C (carbon-14), a rare isotope produced in the atmosphere by cosmic ray interactions. Developed by Willard Libby in 1949, radiocarbon dating became a foundational method in archaeology, paleoclimate studies, and geology, enabling dating of organic materials from the past ~50,000 years with typical precision of ±50–100 years.	The Standardized Precipitation Index (SPI) is a climate index that quantifies precipitation anomalies relative to historical norms, standardized to account for differences in precipitation climatology across regions. Introduced by McKee, Doesken, and Kleist in 1993, SPI has become a primary tool for drought detection and characterization, adopted by meteorological agencies worldwide for operational drought monitoring and early warning systems.