Pengujian emas dengan Ultrasonic atau Gelombang Suara

 

Ultrasonic gold testing is an increasingly popular method in the jewelry world. This method uses high-frequency sound waves to analyze the properties of materials, including gold.

How does it work?

The basic principle of ultrasonic testing is to send sound waves into the material to be tested. These sound waves will then be reflected back when they hit the boundary between two different materials, such as gold and its coating. The time it takes for the sound waves to return and the pattern of their reflection will provide information about:

• Layer thickness: By measuring the time it takes for sound waves to pass through the layer and return, the layer thickness can be determined very accurately.
• Material density: The speed of sound waves in a material is affected by the density of the material. Thus, the density of the material can be estimated.
• Presence of defects: If there are defects or cracks in the material, sound waves will be obstructed or deflected, resulting in different reflection patterns.

Advantages of Ultrasonic Testing

• Non-destructive: This method does not damage the material being tested, making it ideal for high-value jewelry.
• Accurate: Thickness and density measurements can be performed with a very high degree of accuracy.
• Fast: The testing process can be done quickly, making it efficient on an industrial scale.
• Non-invasive: Testing can be performed without damaging the material surface.

Applications in Gold Testing

• Checking the thickness of the coating: Ultrasonic testing is very useful for checking the thickness of the gold coating on gold plated jewellery.
• Detecting defects: This method can be used to detect internal defects such as cracks or cavities in gold bars or jewelry.
• Distinguishing between real and fake gold: By comparing the speed of sound waves in the material being tested with the reference value for pure gold, it can be determined whether the material is real gold or not.

Limitations

• The surface must be smooth: The surface of the material to be tested must be smooth enough for sound waves to propagate properly.
• Special equipment: Special, fairly expensive equipment is required to perform ultrasonic testing.
• Trained operator: Interpretation of test results requires skill and experience.

Pengujian Kadar Emas dengan Alat Modern

 

Gold Content Testing with XRF: Complete Guide

What is XRF?

XRF or X-ray Fluorescence is a chemical analysis technique used to determine the elemental composition of a material non-destructively. In the context of gold testing, XRF works by emitting X-rays into a gold sample. The interaction between the X-rays and the gold atoms will produce fluorescent X-rays with specific energies that are unique to each element. By analyzing the energy and intensity of these fluorescent X-rays, we can determine the purity of the gold.

Why is XRF Used to Measure Gold Content?

• Fast and Accurate: The XRF testing process is very fast, taking only a few seconds to get results. The high accuracy also makes it a very reliable method.
• Non-Destructive: Unlike traditional testing methods that often damage samples, XRF leaves no traces on the gold being tested.
• Portable: Many modern XRF instruments are designed to be portable so they can be taken anywhere for field testing.
• Multi-Element: In addition to gold, XRF can also detect the presence of other elements that may be present in jewelry or other precious metals.

Testing Process with XRF

1. Sample Preparation: The gold sample is cleaned to remove impurities that may interfere with the test results.
2. Measurement: The XRF instrument is directed at the surface of the gold sample. X-rays are emitted and the sensor detects the resulting fluorescent X-rays.
3. Data Analysis: Data obtained from the sensor is then processed by software to produce results in the form of a percentage of gold content.

Benefits of Using XRF:

• Speed: Test results can be obtained within seconds.
• Accuracy: The test results are very accurate and reliable.
• Ease of Use: Modern XRF instruments are very easy to operate, even by users without a technical background.
• Flexibility: Can be used for various types of gold samples, both jewelry and bullion.

Limitations of XRF:

• Penetration Depth: XRF can only analyze the surface layer of a sample. For very thick samples, additional analytical techniques may be required.
• Matrix Interference: The presence of other elements in the sample may interfere with the test results.

XRF Applications in Gold Assay:

• Grade Verification: Ensure the gold grade matches what is stated on the label.
• Alloy Detection: Detecting the presence of other metals mixed with gold.
• Secondhand Appraisal: Assessing the resale value of secondhand gold jewelry.
• Quality Control: Ensuring the quality of gold products produced by the jewelry factory.

 

Jangan Lupa kunjungi terus: www.full-emas.blogspot.com

 

Penyebab Naiknya Harga Emas

 

Kenaikan harga emas bisa dipengaruhi oleh berbagai faktor, baik internal maupun eksternal. Beberapa faktor utama yang sering menjadi penyebab kenaikan harga emas adalah:

• Inflasi: Ketika inflasi tinggi, nilai mata uang cenderung menurun. Emas sering dianggap sebagai lindung nilai terhadap inflasi, sehingga permintaan emas meningkat.
• Kestabilan Ekonomi: Dalam situasi ekonomi yang tidak stabil, seperti resesi atau ketidakpastian politik, investor cenderung mencari aset yang lebih aman seperti emas.
• Tingkat Suku Bunga: Ketika suku bunga rendah atau bahkan negatif, biaya menyimpan uang di bank menjadi mahal. Hal ini mendorong investor untuk mencari alternatif investasi lain, termasuk emas.
• Permintaan Industri: Industri perhiasan dan elektronik juga merupakan konsumen besar emas. Kenaikan permintaan dari industri-industri ini dapat mendorong harga emas naik.
• Ketersediaan Pasokan: Penurunan produksi emas di tambang atau gangguan pasokan juga bisa menyebabkan harga emas naik.
• Faktor Geopolitik: Ketegangan geopolitik, konflik, atau bencana alam dapat meningkatkan ketidakpastian dan mendorong investor untuk membeli emas sebagai aset yang lebih aman.
• Investasi Spekulatif: Aktivitas spekulasi di pasar emas juga dapat mempengaruhi harga. Ketika banyak investor yang berharap harga emas akan terus naik, mereka akan membeli emas, sehingga mendorong harga naik lebih tinggi.

Secara singkat, kenaikan harga emas sering terjadi karena emas dianggap sebagai:

• Lindung nilai terhadap inflasi: Melindungi nilai kekayaan dari penurunan nilai mata uang.
• Aset yang aman: Menyediakan tempat yang aman untuk menyimpan kekayaan dalam situasi yang tidak stabil.
• Komoditas investasi: Digunakan sebagai instrumen investasi untuk memperoleh keuntungan.