30angle:  E[keV] = 0.0158507 *ch-2.07456
90angle:  E[keV] = 0.01950*ch-2.76
145angle: E[keV] = 0.017988  *ch-1.809

I could identify 2 peaks in the 241Am spectra and 4 peaks in the 133Ba. These peaks are fitted with a gaussian to get their position --> linear energy calibration for the combined (Am+Ba) data sets for each detector. The function I used: E(ch) [keV] = m*ch+b

#gaus fit, gaus fit error, literature (nndc), literature error
#literature used:
#https://www.nndc.bnl.gov/nudat2/decaysearchdirect.jsp?nuc=241AM&unc=nds
#https://www.nndc.bnl.gov/nudat2/decaysearchdirect.jsp?nuc=133BA&unc=nds
#where there is no error given, I put +/-.5 to the last digit
1493.31 0.26 26.3446 0.0002
3194.81 0.053 59.5409 0.0001
1721.92 0.0574 30.973 0.0005
1937.28 0.163 34.987 0.0005
2864.67 0.443 53.1622 0.0006
4292.25 0.122 80.9979 0.0011