Hello from Duncan B.C.

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Brian-C
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Joined: 28 Apr 2017, 22:33
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Hello from Duncan B.C.

Post by Brian-C » 29 Apr 2017, 00:05

I'm a blind, 70 year old hobbyist who dabbles in rad science. Purchased a GS1100b a few years ago, and with help, put together a couple of CsI probes. I've been using PRA since version 4. Marek kindly downloaded my JAWS screen reader and modified his programs so I'm able to navigate and play with settings. Of course, I can't see any graph displays, so I export data as text, then load it into Excel. Usually, I can find bumps, and a huge peak from X-rays right at the low end, but when it comes to definitely locating good gamma peaks, I haven't been very successful.
Mostly, I collect background readings on an Aware Electronics RM-80 (LND7313-3) pancake detector with a USB-MSP430 interface module. That's currently hooked up to a quiet little net-book. The module stores data and each morning I download it to my PC. Thus far, I have 24/7 readings back to 2014. With the pancake laying flat on my bedroom desk, the average is around 33 counts per minute. Data is also sent to www.radmon.org every five minutes, my station ID is Sonarflash.
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Besides all this, I'm a ham, VA7BDG, member of our local club, www.cvars.ca, a rockhound, and I write sci-fi/fantasy for a hobby.

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Steven Sesselmann
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Joined: 27 Apr 2015, 11:40
Location: Sydney
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Re: Hello from Duncan B.C.

Post by Steven Sesselmann » 29 Apr 2017, 12:49

Brian,

Welcome to the forum, and well done on navigating around here, I'm not sure how JAWS friendly the forum software is, so please tell me if there is something we can improve. Now that I know you are reading the forum, I shall try to describe my image tags better and encourage others to do the same.

I think the best way for you to make sense of a gamma spectrum would be to first get a sighted person to verify that your setup is working then reduce the number of bins in your histogram to a minimum, before exporting the text file.

The bin size can be changed in the Data Acquisition and Analysis panel, try setting the bin size to 1 arbitrary unit, this will give you 100 bins.

Following below is the 100 bin output from PRA, can you find the peak?

Steven

START -----------------------------------------------
Energy/(keV) Counts
0 2834
16.9044 20068
34.3053 20632
55.8504 14192
77.3955 19752
98.9406 13907
120.4857 13858
142.0308 14248
163.5759 14602
185.121 16760
206.6661 17591
228.2111 16420
249.7562 15695
271.3013 14947
292.8464 14332
314.3915 13805
335.9366 13167
357.4817 12368
379.0268 11773
400.5719 11600
422.117 11198
443.662 10991
465.2071 9245
486.7522 6426
508.2973 4117
529.8424 2974
551.3875 2426
572.9326 2567
594.4777 4265
616.0228 10448
637.5679 26108
659.113 39475
680.658 29606
702.2031 9905
723.7482 1705
745.2933 561
766.8384 433
788.3835 415
809.9286 367
831.4737 410
853.0188 426
874.5639 418
896.109 375
917.654 326
939.1991 315
960.7442 285
982.2893 253
1003.8344 250
1025.3795 257
1046.9246 297
1068.4697 241
1090.0148 232
1111.5599 195
1133.105 186
1154.65 148
1176.1951 137
1197.7402 120
1219.2853 152
1240.8304 155
1262.3755 169
1283.9206 223
1305.4657 236
1327.0108 225
1348.5559 175
1370.101 130
1391.646 110
1413.1911 74
1434.7362 69
1456.2813 57
1477.8264 60
1499.3715 48
1520.9166 55
1542.4617 51
1564.0068 57
1585.5519 47
1607.097 48
1628.642 44
1650.1871 38
1671.7322 30
1693.2773 25
1714.8224 35
1736.3675 29
1757.9126 48
1779.4577 34
1801.0028 46
1822.5479 40
1844.093 49
1865.638 36
1887.1831 35
1908.7282 19
1930.2733 37
1951.8184 26
1973.3635 19
1994.9086 20
2016.4537 20
2037.9988 27
2059.5439 23
2081.089 37
2102.634 37
2124.1791 27
END -------------------------------------------
Steven Sesselmann | Sydney | Australia | gammaspectacular.com | groundpotential.org | rephopper.com | beejewel.com.au |

Brian-C
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Re: Hello from Duncan B.C.

Post by Brian-C » 29 Apr 2017, 21:05

Hi Steven,
Some of these seemed more like my usual small bumps, but others were quite distinct. From my limited key line tables, (thorium and uranium from Marek) I couldn't identify the isotope.
34.3053, 77.3955, 206.6661, 659.113, 853.0188, 1305.4657, 1564.0068, 1801.0028, 1930.2733, 2081.089, 2102.634
What I did was copy your table, go to Excel, paste it in and scan down the count column. After marking each, I went back down, copying each energy to a separate row, then copied that into notepad. One step more than I usually take with a histogram. I'll take your suggestion and change the histogram bin size from 0.1 to 1 today. TTUL. Brian

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Steven Sesselmann
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Location: Sydney
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Re: Hello from Duncan B.C.

Post by Steven Sesselmann » 29 Apr 2017, 21:17

Brian,

I just realised that the data I pasted into the post did not format with proper tabs, so when you copied it to excel it all ended up in the same column.

I have attached the proper excel file on the next line, see if you can download it.
sample-spectrum.xlsx
Sample Spectrum in excel format, click to download
(42.31 KiB) Downloaded 69 times
Steven
Steven Sesselmann | Sydney | Australia | gammaspectacular.com | groundpotential.org | rephopper.com | beejewel.com.au |

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