Exporting Specta from PRA in 1024 Channel Format

[IanMoffat]

Hi all,
Sorry for the newbie question but I am trying to export spectra collected using a GSB-2020-NAI with a 2.0" NaI(TI) Detector which I measured using the PRA software. I need these to be in (ideally) 256 channel format but they can also be in 1024 channel format, so I can calibrate the spectra using GammaSpec software (https://www.gammaspec.com.au/). The export option from PRA provides many more rows than that, which appears to be guided by the highest energy response that was measured (example below). How can I best convert this back to 256 or 1024 so that I can work with it?

Many thanks,
Ian

Height/arb.u Counts
0 0
0.1 0
0.2 0
0.3 653
0.4 480
0.5 388
0.6 422
0.7 452
0.8 488
0.9 493
1 517
1.1 571
1.2 544
1.3 582
1.4 645
1.5 680
1.6 848
1.7 968
1.8 1085
1.9 1064
2 1061
2.1 997
2.2 1088
2.3 1114
2.4 1234
2.5 1377
2.6 1463
2.7 1651
2.8 1878
2.9 1977
3 2149
3.1 2192
3.2 2444
3.3 2554
3.4 2540
3.5 2823
3.6 2806
3.7 2803
3.8 2926
3.9 2897
4 3047
4.1 3036
4.2 3147
4.3 3049
4.4 3076
4.5 3002
4.6 2973
4.7 2856
4.8 2864
4.9 2820
5 2775
5.1 2754
5.2 2814
5.3 2697
5.4 2621
5.5 2564
5.6 2551
5.7 2475
5.8 2441
5.9 2403
6 2299
6.1 2257
6.2 2191
6.3 2169
6.4 2125
6.5 2089
6.6 2037
6.7 2050
6.8 1892
6.9 1919
7 1865
7.1 1853
7.2 1779
7.3 1764
7.4 1657
7.5 1764
7.6 1625
7.7 1601
7.8 1607
7.9 1580
8 1490
8.1 1446
8.2 1438
8.3 1384
8.4 1346
8.5 1323
8.6 1345
8.7 1280
8.8 1193
8.9 1213
9 1171
9.1 1186
9.2 1173
9.3 1083
9.4 1080
9.5 1054
9.6 1032
9.7 1071
9.8 1038
9.9 959
10 973
10.1 959
10.2 916
10.3 897
10.4 859
10.5 839
10.6 872
10.7 832
10.8 798
10.9 784
11 767
11.1 782
11.2 756
11.3 730
11.4 726
11.5 725
11.6 696
11.7 733
11.8 697
11.9 663
12 716
12.1 693
12.2 637
12.3 653
12.4 680
12.5 641
12.6 585
12.7 595
12.8 644
12.9 579
13 532
13.1 524
13.2 528
13.3 507
13.4 455
13.5 453
13.6 435
13.7 433
13.8 432
13.9 360
14 405
14.1 414
14.2 389
14.3 384
14.4 403
14.5 387
14.6 367
14.7 354
14.8 352
14.9 353
15 371
15.1 330
15.2 326
15.3 308
15.4 330
15.5 313
15.6 333
15.7 307
15.8 315
15.9 269
16 309
16.1 279
16.2 262
16.3 264
16.4 249
16.5 265
16.6 258
16.7 228
16.8 272
16.9 259
17 267
17.1 255
17.2 252
17.3 239
17.4 240
17.5 250
17.6 256
17.7 250
17.8 238
17.9 225
18 221
18.1 255
18.2 247
18.3 221
18.4 226
18.5 206
18.6 193
18.7 210
18.8 202
18.9 186
19 196
19.1 170
19.2 192
19.3 153
19.4 169
19.5 155
19.6 147
19.7 156
19.8 166
19.9 138
20 170
20.1 145
20.2 119
20.3 142
20.4 151
20.5 168
20.6 130
20.7 142
20.8 142
20.9 131
21 147
21.1 137
21.2 127
21.3 119
21.4 135
21.5 124
21.6 136
21.7 135
21.8 141
21.9 121
22 119
22.1 110
22.2 114
22.3 108
22.4 115
22.5 99
22.6 121
22.7 119
22.8 93
22.9 96
23 122
23.1 106
23.2 116
23.3 106
23.4 115
23.5 102
23.6 100
23.7 94
23.8 96
23.9 100
24 90
24.1 128
24.2 103
24.3 108
24.4 107
24.5 111
24.6 85
24.7 88
24.8 96
24.9 110
25 94
25.1 102
25.2 94
25.3 94
25.4 96
25.5 94
25.6 100
25.7 114
25.8 93
25.9 95
26 97
26.1 99
26.2 93
26.3 90
26.4 88
26.5 87
26.6 90
26.7 87
26.8 84
26.9 77
27 90
27.1 76
27.2 69
27.3 96
27.4 86
27.5 81
27.6 73
27.7 78
27.8 77
27.9 67
28 83
28.1 77
28.2 73
28.3 68
28.4 63
28.5 62
28.6 77
28.7 87
28.8 73
28.9 75
29 82
29.1 96
29.2 81
29.3 95
29.4 84
29.5 74
29.6 105
29.7 85
29.8 86
29.9 97
30 109
30.1 73
30.2 82
30.3 85
30.4 73
30.5 81
30.6 86
30.7 76
30.8 83
30.9 78
31 79
31.1 83
31.2 74
31.3 59
31.4 65
31.5 66
31.6 75
31.7 74
31.8 59
31.9 62
32 49
32.1 63
32.2 54
32.3 49
32.4 47
32.5 60
32.6 39
32.7 50
32.8 52
32.9 48
33 46
33.1 50
33.2 43
33.3 47
33.4 40
33.5 49
33.6 42
33.7 47
33.8 51
33.9 40
34 35
34.1 42
34.2 36
34.3 41
34.4 45
34.5 39
34.6 41
34.7 42
34.8 53
34.9 31
35 41
35.1 48
35.2 47
35.3 45
35.4 33
35.5 36
35.6 52
35.7 41
35.8 40
35.9 59
36 39
36.1 43
36.2 44
36.3 44
36.4 45
36.5 34
36.6 35
36.7 53
36.8 47
36.9 34
37 47
37.1 37
37.2 39
37.3 39
37.4 31
37.5 42
37.6 37
37.7 44
37.8 51
37.9 36
38 34
38.1 40
38.2 48
38.3 33
38.4 49
38.5 34
38.6 49
38.7 23
38.8 32
38.9 33
39 42
39.1 34
39.2 37
39.3 31
39.4 38
39.5 35
39.6 41
39.7 40
39.8 36
39.9 28
40 39
40.1 34
40.2 31
40.3 24
40.4 35
40.5 26
40.6 35
40.7 33
40.8 32
40.9 30
41 39
41.1 32
41.2 37
41.3 37
41.4 22
41.5 27
41.6 35
41.7 53
41.8 32
41.9 30
42 30
42.1 41
42.2 38
42.3 26
42.4 26
42.5 26
42.6 39
42.7 29
42.8 42
42.9 34
43 24
43.1 39
43.2 29
43.3 37
43.4 23
43.5 33
43.6 27
43.7 35
43.8 31
43.9 39
44 30
44.1 34
44.2 31
44.3 29
44.4 30
44.5 48
44.6 34
44.7 31
44.8 31
44.9 35
45 42
45.1 30
45.2 31
45.3 27
45.4 31
45.5 35
45.6 46
45.7 41
45.8 44
45.9 36
46 36
46.1 34
46.2 29
46.3 33
46.4 31
46.5 39
46.6 51
46.7 29
46.8 32
46.9 37
47 37
47.1 35
47.2 31
47.3 31
47.4 36
47.5 27
47.6 21
47.7 32
47.8 34
47.9 34
48 30
48.1 29
48.2 24
48.3 20
48.4 34
48.5 34
48.6 26
48.7 25
48.8 21
48.9 34
49 33
49.1 20
49.2 21
49.3 23
49.4 20
49.5 19
49.6 34
49.7 19
49.8 30
49.9 22
50 25
50.1 25
50.2 25
50.3 22
50.4 26
50.5 17
50.6 23
50.7 21
50.8 18
50.9 26
51 24
51.1 23
51.2 20
51.3 23
51.4 24
51.5 16
51.6 18
51.7 23
51.8 23
51.9 22
52 16
52.1 18
52.2 21
52.3 23
52.4 18
52.5 18
52.6 11
52.7 30
52.8 22
52.9 23
53 17
53.1 20
53.2 22
53.3 17
53.4 14
53.5 16
53.6 23
53.7 25
53.8 16
53.9 23
54 20
54.1 23
54.2 15
54.3 21
54.4 23
54.5 22
54.6 17
54.7 18
54.8 23
54.9 23
55 20
55.1 21
55.2 20
55.3 34
55.4 22
55.5 24
55.6 16
55.7 19
55.8 29
55.9 20
56 29
56.1 28
56.2 30
56.3 18
56.4 26
56.5 23
56.6 22
56.7 27
56.8 27
56.9 20
57 23
57.1 21
57.2 14
57.3 19
57.4 23
57.5 19
57.6 16
57.7 23
57.8 18
57.9 17
58 15
58.1 16
58.2 16
58.3 20
58.4 20
58.5 16
58.6 20
58.7 23
58.8 7
58.9 15
59 21
59.1 16
59.2 17
59.3 10
59.4 14
59.5 15
59.6 26
59.7 16
59.8 13
59.9 12
60 16
60.1 15
60.2 21
60.3 18
60.4 11
60.5 19
60.6 20
60.7 21
60.8 15
60.9 12
61 16
61.1 10
61.2 21
61.3 14
61.4 12
61.5 7
61.6 18
61.7 17
61.8 11
61.9 21
62 12
62.1 11
62.2 10
62.3 14
62.4 11
62.5 18
62.6 16
62.7 9
62.8 4
62.9 14
63 13
63.1 12
63.2 12
63.3 17
63.4 6
63.5 11
63.6 11
63.7 9
63.8 8
63.9 9
64 9
64.1 11
64.2 10
64.3 4
64.4 9
64.5 7
64.6 6
64.7 6
64.8 6
64.9 5
65 7
65.1 9
65.2 7
65.3 9
65.4 8
65.5 9
65.6 7
65.7 10
65.8 10
65.9 12
66 5
66.1 7
66.2 12
66.3 11
66.4 15
66.5 12
66.6 6
66.7 8
66.8 14
66.9 7
67 1
67.1 7
67.2 5
67.3 8
67.4 14
67.5 10
67.6 12
67.7 11
67.8 9
67.9 10
68 9
68.1 8
68.2 10
68.3 11
68.4 13
68.5 13
68.6 11
68.7 21
68.8 12
68.9 21
69 20
69.1 12
69.2 14
69.3 18
69.4 22
69.5 21
69.6 28
69.7 22
69.8 19
69.9 29
70 23
70.1 35
70.2 20
70.3 19
70.4 37
70.5 25
70.6 28
70.7 24
70.8 26
70.9 35
71 29
71.1 34
71.2 33
71.3 35
71.4 32
71.5 26
71.6 29
71.7 43
71.8 40
71.9 34
72 35
72.1 42
72.2 29
72.3 43
72.4 28
72.5 40
72.6 31
72.7 31
72.8 31
72.9 28
73 26
73.1 20
73.2 26
73.3 20
73.4 17
73.5 27
73.6 28
73.7 21
73.8 11
73.9 16
74 17
74.1 12
74.2 14
74.3 14
74.4 10
74.5 14
74.6 13
74.7 12
74.8 7
74.9 12
75 6
75.1 8
75.2 8
75.3 7
75.4 4
75.5 6
75.6 5
75.7 2
75.8 8
75.9 6
76 8
76.1 6
76.2 11
76.3 4
76.4 3
76.5 3
76.6 8
76.7 8
76.8 5
76.9 5
77 5
77.1 5
77.2 8
77.3 10
77.4 3
77.5 10
77.6 7
77.7 11
77.8 9
77.9 4
78 9
78.1 10
78.2 6
78.3 8
78.4 6
78.5 6
78.6 6
78.7 10
78.8 9
78.9 5
79 8
79.1 5
79.2 6
79.3 7
79.4 3
79.5 5
79.6 7
79.7 5
79.8 7
79.9 8
80 11
80.1 8
80.2 5
80.3 6
80.4 6
80.5 5
80.6 6
80.7 3
80.8 7
80.9 1
81 4
81.1 6
81.2 3
81.3 6
81.4 3
81.5 3
81.6 4
81.7 6
81.8 5
81.9 2
82 10
82.1 5
82.2 8
82.3 7
82.4 4
82.5 5
82.6 4
82.7 5
82.8 3
82.9 4
83 7
83.1 7
83.2 5
83.3 4
83.4 2
83.5 9
83.6 4
83.7 1
83.8 4
83.9 4
84 4
84.1 5
84.2 5
84.3 3
84.4 3
84.5 5
84.6 8
84.7 2
84.8 6
84.9 4
85 8
85.1 6
85.2 4
85.3 6
85.4 7
85.5 2
85.6 4
85.7 8
85.8 2
85.9 7
86 1
86.1 6
86.2 10
86.3 7
86.4 5
86.5 4
86.6 10
86.7 6
86.8 3
86.9 6
87 5
87.1 2
87.2 5
87.3 7
87.4 4
87.5 6
87.6 4
87.7 6
87.8 5
87.9 6
88 6
88.1 3
88.2 2
88.3 6
88.4 6
88.5 2
88.6 4
88.7 9
88.8 2
88.9 5
89 5
89.1 5
89.2 11
89.3 2
89.4 5
89.5 5
89.6 1
89.7 1
89.8 2
89.9 3
90 3
90.1 3
90.2 3
90.3 4
90.4 2
90.5 3
90.6 1
90.7 6
90.8 5
90.9 2
91 7
91.1 2
91.2 2
91.3 6
91.4 1
91.5 5
91.6 6
91.7 3
91.8 2
91.9 8
92 1
92.1 2
92.2 3
92.3 5
92.4 3
92.5 4
92.6 3
92.7 5
92.8 2
92.9 3
93 4
93.1 4
93.2 3
93.3 3
93.4 4
93.5 1
93.6 3
93.7 1
93.8 3
93.9 1
94 4
94.1 3
94.2 4
94.3 2
94.4 3
94.5 4
94.6 4
94.7 3
94.8 2
94.9 1
95 4
95.1 3
95.2 3
95.3 2
95.4 2
95.5 3
95.6 6
95.7 2
95.8 4
95.9 1
96 2
96.1 2
96.2 3
96.3 1
96.4 5
96.5 2
96.6 5
96.7 3
96.8 9
96.9 4
97 3
97.1 2
97.2 0
97.3 2
97.4 1
97.5 3
97.6 5
97.7 2
97.8 4
97.9 0
98 1
98.1 2
98.2 3
98.3 2
98.4 8
98.5 3
98.6 4
98.7 5
98.8 2
98.9 4
99 5
99.1 2
99.2 4
99.3 0
99.4 5
99.5 2
99.6 3
99.7 3
99.8 3
99.9 1
100 1
100.1 3
100.2 1
100.3 1
100.4 3
100.5 6
100.6 3
100.7 5
100.8 4
100.9 3
101 3
101.1 2
101.2 5
101.3 2
101.4 4
101.5 7
101.6 2
101.7 2
101.8 3
101.9 6
102 2
102.1 2
102.2 2
102.3 7
102.4 4
102.5 7
102.6 4
102.7 6
102.8 1
102.9 2
103 5
103.1 7
103.2 1
103.3 5
103.4 7
103.5 2
103.6 5
103.7 7
103.8 4
103.9 1
104 3
104.1 8
104.2 3
104.3 3
104.4 7
104.5 5
104.6 4
104.7 6
104.8 10
104.9 6
105 5
105.1 3
105.2 2
105.3 8
105.4 1
105.5 3
105.6 0
105.7 6
105.8 5
105.9 5
106 2
106.1 3
106.2 5
106.3 2
106.4 3
106.5 5
106.6 4
106.7 4
106.8 3
106.9 0
107 7
107.1 6
107.2 1
107.3 8
107.4 7
107.5 4
107.6 5
107.7 5
107.8 4
107.9 4
108 3
108.1 4
108.2 7
108.3 5
108.4 2
108.5 6
108.6 7
108.7 9
108.8 4
108.9 10
109 6
109.1 5
109.2 1
109.3 2
109.4 5
109.5 5
109.6 8
109.7 6
109.8 6
109.9 7
110 3
110.1 5
110.2 4
110.3 7
110.4 3
110.5 4
110.6 9
110.7 3
110.8 7
110.9 2
111 9
111.1 8
111.2 8
111.3 5
111.4 2
111.5 4
111.6 5
111.7 1
111.8 6
111.9 1
112 3
112.1 9
112.2 3
112.3 8
112.4 2
112.5 7
112.6 5
112.7 5
112.8 4
112.9 3
113 3
113.1 7
113.2 7
113.3 2
113.4 4
113.5 5
113.6 4
113.7 1
113.8 5
113.9 4
114 2
114.1 4
114.2 6
114.3 4
114.4 6
114.5 4
114.6 4
114.7 6
114.8 4
114.9 13
115 11
115.1 12
115.2 11
115.3 10
115.4 7
115.5 10
115.6 14
115.7 15
115.8 8
115.9 10
116 14
116.1 9
116.2 10
116.3 6
116.4 8
116.5 8
116.6 5
116.7 3
116.8 8
116.9 6
117 12
117.1 9
117.2 4
117.3 8
117.4 4
117.5 5
117.6 9
117.7 9
117.8 10
117.9 18
118 18
118.1 24
118.2 31
118.3 28
118.4 48
118.5 47
118.6 47
118.7 44
118.8 55
118.9 42
119 40
119.1 38
119.2 40
119.3 41
119.4 42
119.5 30
119.6 44
119.7 31
119.8 37
119.9 55
120 37
120.1 33
120.2 33
120.3 26
120.4 26
120.5 42
120.6 35
120.7 30
120.8 46
120.9 32
121 35
121.1 42
121.2 36
121.3 34
121.4 43
121.5 45
121.6 50
121.7 49
121.8 53
121.9 44
122 43
122.1 20
122.2 13
122.3 12
122.4 5
122.5 4
122.6 3
122.7 3
122.8 1
122.9 1
123 2
123.1 0
123.2 0
123.3 1
123.4 0
123.5 0
123.6 1
123.7 1
123.8 0
123.9 1
124 0
124.1 0
124.2 0
124.3 0
124.4 0
124.5 1
124.6 1
124.7 0
124.8 0
124.9 1
125 0
125.1 0
125.2 0
125.3 0
125.4 0
125.5 1
125.6 0
125.7 1
125.8 0
125.9 0
126 0
126.1 0
126.2 1
126.3 0
126.4 0
126.5 0
126.6 0
126.7 0
126.8 0
126.9 0
127 0
127.1 0
127.2 0
127.3 0
127.4 0
127.5 0
127.6 0
127.7 0
127.8 0
127.9 0
128 0
128.1 0
128.2 0
128.3 0
128.4 0
128.5 0
128.6 0
128.7 0
128.8 0
128.9 0
129 0
129.1 0
129.2 0
129.3 1
129.4 0
129.5 0
129.6 0
129.7 0
129.8 0
129.9 0
130 0
130.1 0
130.2 0
130.3 0
130.4 0
130.5 0
130.6 0
130.7 0
130.8 0
130.9 0
131 0
131.1 0
131.2 0
131.3 0
131.4 0
131.5 0
131.6 0
131.7 0
131.8 0
131.9 0
132 0
132.1 0
132.2 0
132.3 0
132.4 0
132.5 0
132.6 0
132.7 0
132.8 0
132.9 0
133 0
133.1 0
133.2 0
133.3 0
133.4 0
133.5 0
133.6 0
133.7 0
133.8 0
133.9 0
134 0
134.1 0
134.2 0
134.3 0
134.4 0
134.5 0
134.6 0
134.7 0
134.8 0
134.9 0
135 0
135.1 0
135.2 0
135.3 0
135.4 0
135.5 0
135.6 0
135.7 0
135.8 0
135.9 0
136 0
136.1 0
136.2 0
136.3 0
136.4 0
136.5 0
136.6 0
136.7 0
136.8 0
136.9 0
137 0
137.1 1
137.2 0
137.3 0
137.4 0
137.5 0
137.6 0
137.7 0
137.8 0
137.9 0
138 0
138.1 0
138.2 0
138.3 0
138.4 0
138.5 0
138.6 0
138.7 0
138.8 0
138.9 0
139 0
139.1 0
139.2 0
139.3 0
139.4 0
139.5 0
139.6 0
139.7 0
139.8 0
139.9 0
140 0
140.1 0
140.2 0
140.3 0
140.4 0
140.5 0
140.6 0
140.7 0
140.8 0
140.9 0
141 0
141.1 0
141.2 0
141.3 0
141.4 0
141.5 0
141.6 0
141.7 0
141.8 0
141.9 0
142 0
142.1 0
142.2 0
142.3 0
142.4 0
142.5 0
142.6 0
142.7 0
142.8 0
142.9 0
143 0
143.1 0
143.2 0
143.3 0
143.4 0
143.5 0
143.6 0
143.7 0
143.8 0
143.9 0
144 0
144.1 0
144.2 0
144.3 0
144.4 0
144.5 0
144.6 0
144.7 0
144.8 0
144.9 0
145 0
145.1 0
145.2 0
145.3 0
145.4 0
145.5 0
145.6 0
145.7 0
145.8 0
145.9 0
146 0
146.1 0
146.2 0
146.3 0
146.4 0
146.5 0
146.6 0
146.7 0
146.8 0
146.9 0
147 0
147.1 0
147.2 0
147.3 0
147.4 0
147.5 0
147.6 0
147.7 0
147.8 0
147.9 0
148 0
148.1 0
148.2 0
148.3 0
148.4 0
148.5 0
148.6 0
148.7 0
148.8 0
148.9 0
149 0
149.1 0
149.2 0
149.3 0
149.4 0
149.5 0
149.6 0
149.7 0
149.8 0
149.9 0
150 0
150.1 0
150.2 0
150.3 0
150.4 0
150.5 0
150.6 0
150.7 0
150.8 0
150.9 0
151 0
151.1 0
151.2 0
151.3 0
151.4 0
151.5 0
151.6 0
151.7 0
151.8 0
151.9 0
152 0
152.1 0
152.2 0
152.3 0
152.4 0
152.5 0
152.6 0
152.7 0
152.8 0
152.9 0
153 0
153.1 0
153.2 0
153.3 0
153.4 0
153.5 0
153.6 0
153.7 0
153.8 0
153.9 0
154 0
154.1 0
154.2 0
154.3 0
154.4 0
154.5 0
154.6 0
154.7 0
154.8 0
154.9 0
155 0
155.1 0
155.2 0
155.3 0
155.4 0
155.5 0
155.6 0
155.7 0
155.8 0
155.9 0
156 0
156.1 0
156.2 0
156.3 0
156.4 0
156.5 0
156.6 0
156.7 0
156.8 0
156.9 0
157 0
157.1 0
157.2 0
157.3 0
157.4 0
157.5 0
157.6 0
157.7 0
157.8 0
157.9 0
158 0
158.1 0
158.2 0
158.3 0
158.4 0
158.5 0
158.6 0
158.7 0
158.8 0
158.9 0
159 0
159.1 0
159.2 0
159.3 0
159.4 0
159.5 0
159.6 0
159.7 0
159.8 0
159.9 0
160 0
160.1 0
160.2 0
160.3 0
160.4 0
160.5 0
160.6 0
160.7 0
160.8 0
160.9 0
161 0
161.1 0
161.2 0
161.3 0
161.4 0
161.5 0
161.6 0
161.7 0
161.8 0
161.9 0
162 0
162.1 0
162.2 0
162.3 0
162.4 0
162.5 0
162.6 0
162.7 0
162.8 0
162.9 0
163 0
163.1 0
163.2 0
163.3 0
163.4 0
163.5 0
163.6 0
163.7 0
163.8 0
163.9 0
164 0
164.1 0
164.2 0
164.3 0
164.4 0
164.5 0
164.6 0
164.7 0
164.8 0
164.9 0
165 0
165.1 0
165.2 0
165.3 0
165.4 0
165.5 0
165.6 0
165.7 0
165.8 0
165.9 0
166 0
166.1 0
166.2 0
166.3 0
166.4 0
166.5 0
166.6 0
166.7 0
166.8 0
166.9 0
167 0
167.1 0
167.2 0
167.3 0
167.4 0
167.5 0
167.6 0
167.7 0
167.8 0
167.9 0
168 0
168.1 0
168.2 0
168.3 0
168.4 0
168.5 0
168.6 0
168.7 0
168.8 0
168.9 0
169 0
169.1 0
169.2 0
169.3 0
169.4 0
169.5 0
169.6 0
169.7 0
169.8 0
169.9 0
170 0
170.1 0
170.2 0
170.3 0
170.4 0
170.5 0
170.6 0
170.7 0
170.8 0
170.9 0
171 0
171.1 0
171.2 0
171.3 0
171.4 0
171.5 0
171.6 0
171.7 0
171.8 0
171.9 0
172 0
172.1 0
172.2 0
172.3 0
172.4 0
172.5 0
172.6 0
172.7 0
172.8 0
172.9 0
173 0
173.1 0
173.2 0
173.3 0
173.4 0
173.5 0
173.6 0
173.7 0
173.8 0
173.9 0
174 0
174.1 0
174.2 0
174.3 0
174.4 0
174.5 0
174.6 0
174.7 0
174.8 0
174.9 0
175 0
175.1 0
175.2 0
175.3 0
175.4 0
175.5 0
175.6 0
175.7 0
175.8 0
175.9 0
176 0
176.1 0
176.2 0
176.3 0
176.4 0
176.5 0
176.6 0
176.7 0
176.8 0
176.9 0
177 0
177.1 0
177.2 0
177.3 0
177.4 0
177.5 0
177.6 0
177.7 0
177.8 0
177.9 0
178 0
178.1 0
178.2 0
178.3 0
178.4 0
178.5 0
178.6 0
178.7 0
178.8 0
178.9 0
179 0
179.1 0
179.2 0
179.3 0
179.4 0
179.5 0
179.6 0
179.7 0
179.8 0
179.9 0
180 0
180.1 0
180.2 0
180.3 0
180.4 0
180.5 0
180.6 0
180.7 0
180.8 0
180.9 0
181 0
181.1 0
181.2 0
181.3 0
181.4 0
181.5 0
181.6 0
181.7 0
181.8 0
181.9 0
182 0
182.1 0
182.2 0
182.3 0
182.4 0
182.5 0
182.6 0
182.7 0
182.8 0
182.9 0
183 0
183.1 0
183.2 0
183.3 0
183.4 0
183.5 0
183.6 0
183.7 0
183.8 0
183.9 0
184 0
184.1 0
184.2 0
184.3 0
184.4 0
184.5 0
184.6 0
184.7 0
184.8 0
184.9 0
185 0
185.1 0
185.2 0
185.3 0
185.4 0
185.5 0
185.6 0
185.7 0
185.8 0
185.9 0
186 0
186.1 0
186.2 0
186.3 0
186.4 0
186.5 0
186.6 0
186.7 0
186.8 0
186.9 0
187 0
187.1 0
187.2 0
187.3 0
187.4 0
187.5 0
187.6 0
187.7 0
187.8 0
187.9 0
188 0
188.1 0
188.2 0
188.3 0
188.4 0
188.5 0
188.6 1

[Sesselmann]

Ian,

PRA does not allow direct definition of the number of channels, but you do have control over the bin size.

The full spectrum is 100 arb.u so if you set the bin size to 0.1 it becomes 100/0.1 = 1000 channels

If you for example wanted 1024 channels you would set the bin size to 0.0977 (get you close)

For 256 channels the arb.u would be about 0.392 arb.u

On the other hand you could try Impulse where you can directly set the number of channels. https://www.gammaspectacular.com/blue/s ... ds/impulse

Steven

PS: You could have attached a csv file to your post ....

[IanMoffat]

Hi Steven,
Thank you for your very useful reply! I will try out Impulse in the future but is there a way to convert my already collected data to 256 (or 1024) channels?

Many thanks,
Ian

[Sesselmann]

Ian,

If you still have the PRA file it should be easy to re-export it as 256 channels, otherwise it's an excel job.

Steven

[IanMoffat]

Thanks Steven, this is incredibly helpful!

Two related questions for you:

1) Can you advise how to do the 256 channel export from PRA? I've tried this but it has proved beyond my (limited) capabilities...

2) The spectra attached above seems to have more than 100 arb.u (in this case 188.6). Am I understanding it incorrectly?

Many thanks in advance,
Ian

[Sesselmann]

Ian,

Providing you have the original PRA file it is easy... The good thing about PRA is that it stores the entire recording, i.e. every pulse along with it's height and distortion number, not just counts per channel (a stroke of brilliance by Marek).

1) Open PRA, then open your original .pls file.

2) View the pulse height histogram window and data acquisition and analysis

3) Set bin size to 0.46 and click apply

4) Now export the Pulse height Histogram as a text file

You should end up with around 261 channels, so just open it and delete the last 5 rows.

**
It seems like PRA spectra often go to 120 arb.u, this is probably because the line-in range on sound cards is around +- 1.2V, this would make sense as 1 arb.u would be exactly 0.01 Volt

Screen shot

Apologies, the forum does not permit text files...

--------------------------------------------------------------------------
Thorium spectrum in 256 channels
--------------------------------------------------------------------------

Height/arb.u Counts
0 0
0.46 18250
0.92 13345
1.38 16391
1.84 23451
2.3 28242
2.76 45825
3.22 83111
3.68 54897
4.14 30717
4.6 22434
5.06 21010
5.52 19282
5.98 16283
6.44 14761
6.9 13430
7.36 13193
7.82 14285
8.28 17349
8.74 19180
9.2 41444
9.66 47602
10.12 20680
10.58 11181
11.04 10361
11.5 9235
11.96 8424
12.42 8839
12.88 11418
13.34 12281
13.8 9078
14.26 6059
14.72 4878
15.18 4756
15.64 4626
16.1 4530
16.56 4271
17.02 4123
17.48 4546
17.94 4695
18.4 4657
18.86 4521
19.32 4742
19.78 4928
20.24 4576
20.7 4055
21.16 4460
21.62 5962
22.08 7440
22.54 7744
23 6158
23.46 4259
23.92 3108
24.38 2825
24.84 2722
25.3 2714
25.76 2650
26.22 2634
26.68 2802
27.14 2816
27.6 2998
28.06 2749
28.52 2566
28.98 2400
29.44 2309
29.9 2182
30.36 1998
30.82 1932
31.28 1899
31.74 2072
32.2 2251
32.66 2564
33.12 3042
33.58 3487
34.04 3681
34.5 3310
34.96 3112
35.42 2934
35.88 2736
36.34 2264
36.8 1606
37.26 1268
37.72 1019
38.18 985
38.64 950
39.1 979
39.56 1017
40.02 997
40.48 1000
40.94 890
41.4 818
41.86 823
42.32 765
42.78 683
43.24 738
43.7 680
44.16 684
44.62 676
45.08 672
45.54 623
46 590
46.46 596
46.92 582
47.38 589
47.84 542
48.3 563
48.76 552
49.22 610
49.68 597
50.14 652
50.6 634
51.06 610
51.52 633
51.98 760
52.44 942
52.9 1000
53.36 1037
53.82 868
54.28 790
54.74 647
55.2 666
55.66 655
56.12 758
56.58 728
57.04 784
57.5 830
57.96 992
58.42 1157
58.88 1501
59.34 2557
59.8 3629
60.26 3830
60.72 1981
61.18 480
61.64 269
62.1 194
62.56 115
63.02 81
63.48 64
63.94 55
64.4 41
64.86 60
65.32 54
65.78 32
66.24 20
66.7 34
67.16 37
67.62 32
68.08 21
68.54 28
69 23
69.46 33
69.92 23
70.38 17
70.84 23
71.3 17
71.76 17
72.22 18
72.68 17
73.14 20
73.6 13
74.06 18
74.52 13
74.98 13
75.44 11
75.9 25
76.36 15
76.82 12
77.28 12
77.74 14
78.2 12
78.66 9
79.12 11
79.58 11
80.04 16
80.5 10
80.96 12
81.42 17
81.88 5
82.34 7
82.8 10
83.26 6
83.72 8
84.18 8
84.64 11
85.1 5
85.56 7
86.02 9
86.48 5
86.94 3
87.4 8
87.86 6
88.32 8
88.78 9
89.24 11
89.7 9
90.16 9
90.62 8
91.08 6
91.54 6
92 1
92.46 6
92.92 8
93.38 5
93.84 5
94.3 11
94.76 8
95.22 7
95.68 16
96.14 5
96.6 8
97.06 8
97.52 9
97.98 10
98.44 11
98.9 8
99.36 8
99.82 8
100.28 8
100.74 10
101.2 9
101.66 12
102.12 8
102.58 6
103.04 14
103.5 14
103.96 15
104.42 21
104.88 12
105.34 16
105.8 22
106.26 24
106.72 25
107.18 23
107.64 38
108.1 38
108.56 42
109.02 39
109.48 45
109.94 55
110.4 56
110.86 83
111.32 74
111.78 75
112.24 53
112.7 15
113.16 6
113.62 5
114.08 0
114.54 3
115 2
115.46 1
115.92 1
116.38 1
116.84 0

[IanMoffat]

Hi Steven,
Thank you, this is very useful!

One final question about this, my original file went up to ~180 arb rather than 120. Should I amend the bin size to include the higher arb numbers or just assume a maximum of 120 (or 100) arb and ignore everything above this? The highest recorded arb # changes between files and always seems to include a count so I assume it just reports this up to the highest measurement rather than providing the total range.

Many thanks,
Ian

[Sesselmann]

One final question about this, my original file went up to ~180 arb rather than 120.

Ian, It sounds like you may be running your detector gain a bit high. A good rule of thumb is to set the gain where K40 (1640 keV) peak lands at around 50 arb.u. (middle of your spectrum).

The reason why PRA sometimes records counts higher than 120 arb.u. is in the pulse height calculation method, this is how it works...

PRA PULSE FINDER
The signal from your detector comes in as a stream of numbers from 0 to 65536 (16 bit), this range represents the CODEC input voltage range -1.2 to +1.2 volts.

The program looks at the first 60 samples and tests if sample #30 has maximum value if not it move one sample to the right and check again.

When it loops through and eventually finds a string of 60 samples and sample #30 is the highest value, it then checks if sample #30 exceeds the set threshold.

If so, it has successfully found a pulse, now it looks in this string to find the minimum value and calculates:

\[ max(sample) - min(sample) = Pulse \ height \]

The reason you get samples larger that 120 arb.u is that large positive pulses are often followed by a tail that goes negative before the baseline is restored.

That said the advantage of this method over other methods is that it does not depend on baseline stabilisation.

* For simplicity I omitted the function of normalisation, every pulse is also normalised squared and summed in order to calculate a distortion factor, this distortion factor is compared to the mean pulse shape and filtered out if the distortion exceeds your set threshold.

If my explanation has left you more confused, don't worry it's not necessary to understand the algorithm to use PRA or Impulse.

Last but not least, yes, just adjust the bin size until you get your whole spectrum into the 256 channels.

Steven