<caption><image_0>The image is a slide from a presentation on-site walkthrough. It has a blue background and white text. The slide is divided into three sections.

The first section is titled "On-Site Walkthrough" and has a title that reads "Observe and understand processes from raw materials through finished product". Below the title, there is a question that reads, "Are processes hot, cold, fast, slow, many, few? Where do workers interact with the process? What equipment is being used? What controls are in place? Have there been any problems controlling contaminants? Ask workers and managers questions. Review safety data sheets."

At the bottom of the slide, there are two buttons - "METHAST" and "MEPHAST".</caption><caption><image_1>The image is a set of four graphs that show the different types of ultrasonic particles represented by mass, seasonal differences. The graphs are arranged in a grid-like pattern, with each graph representing a different type of particle.

The first graph on the top left shows the number of particles in a particle, which is represented by a red dot. The second graph shows the mass of the particle, with a blue dot representing the mass and a green dot representing a mass. The third graph shows that the mass is higher than the mass, indicating that it is higher in the winter and spring. The fourth graph shows a blue and green color scheme, with the mass being higher than spring and the spring being lower than spring. 

There is also a red arrow pointing to the top right corner of the graph, indicating the direction of the mass in the graph. The graph also has a label that reads "Different by Season" and "Similar By Season".

At the bottom of the image, there is a blue bar that says "27". This indicates that the graph is a representation of the ultrafine particles that are represented by the mass.</caption><caption><image_2>The image is a slide from a presentation about wipe sampling. It has a blue background and white text. The slide has a title "Wipe Sampling" at the top and a subtitle that reads "Evaluate surface contamination to assess hygiene, generally not correlated to worker inhalation exposures". Below the title, there is an image of a person's hand wearing blue gloves and holding a piece of paper. 

On the right side of the slide, there are three bullet points that explain how wipe sampling can be used to assess the quality of work. The first bullet point explains that sample specific areas with gauze, filter paper, or pre-precisioned wipes, and the second bullet point provides a step-by-step guide on how to clean the surface.

The slide also includes a brief description of the sample sampling process, which explains how it can be applied to the surface and how it is clean enough. There is also a link to a website for more information about the process.</caption><caption><image_3>The image is a screenshot of a presentation slide titled "Case I: MWCNT Synthesis". The slide is divided into two columns. The first column is titled "Location" and the second column is labeled "Elemental carbon". 

The first column has a table with three columns - Location, Number, and Not Available. The table has three rows, each representing a different type of carbon. The second row has three columns labeled "Name", "Number", and "Not Available". The third column has two columns labeled as "None" and "None". The table also has a column labeled "None", which is likely the number of atoms or molecules in each type of molecule.

At the bottom of the slide, there is a note that reads "Case studies from professional development course given by the NIDGH nanomaterial field team (Hodson and Eastside)". The note is written in black text on a white background.</caption> Finally, you should review safety data sheets. approximately 0.1 milligram per meter cubed. Here’s an example of task-based monitoring. Another way is to use electron microscopy. Total dust, or open-face cassettes, collect all particles without intentionally separating out any size fraction, which may be helpful in Size-selective samplers are used to assess personal breathing zone exposures. Respirable sampling is called for in the NIOSH recommended exposure limits for titanium dioxide and carbon nanotubes and nanofibers. There are qualitative or quantitative methods, including the following. Generally, gauze, filter paper, or pre-moistened wipes are used to sample a pre-determined area, as shown in the photo. NMAM Method 9100 for measuring lead in surface wipes, or NMAM Method 9102 for measuring elements on wipes. The question is, "How clean is clean enough?", and there is some guidance that Brookhaven National Laboratory has provided, Now, I will introduce three case studies that exemplify the use of the AIHA Exposure Assessment Strategy. They are fictional, but based on experience gained by the NIOSH nanotechnology field team over many years. In the first case study, we evaluate exposures in the synthesis of multi-walled carbon nanotubes.
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